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Lecture 20. Electrochemistry Pt. 5.

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OK I can I have your attention please on 1 quick announcement before I began and that is to remind you that the coming Wednesday you have a 2nd term exams and you already got an e-mail from me a duty the details about the examiner and the same information on the class website as well OK I do what remind you that please come to class on time we will start to examine promptly on the hour OK and all of you have assigned seats so it's important that you check and know exactly where you seat assignment is and if you remember there multiple versions of exam so your seat numbers associated with the exam that you get so it's very important legacy in the right seed and that you don't sit somewhere else you do we will find out and that really is your only chance OK because that would be considered cheating are there any questions before I begin yes correct it depends far at several Boston was that In Seoul notation do you need to include age classes and forge minuses right and for me that it depends if age class and for which minus is part of the reaction in other words they undergo a change the reduction or oxidation you would include them alright if not you do not need to include them are right there with 2 2 exceptions would include them is like I was sure those examples there on the site if you have magnate in acidic solution magnet you put at last ,comma Aminul for miners are right and then there's another 1 where it's
dichromate those reactions take place only solutions in acidic right and I will I will take some examples where on show you that became a father that you don't know if they are not part of the balanced equation you don't include them again in the house OK so getting
back out a reminder that there's a review for the 2nd midterm exam you iodine e-mail from me give you that information the same information on the class website as well OK I saw you remember the last time we talked about the the fact that you take a gallon itself takes self and that the voltage that you measure on the bold meter is called the cell potential are right and so you take yourself potential the symbol for the cell potential is the sale and this is the potential that would measure if it's under standard conditions we said that then you put a lot on top and because you sells and what that means is that under standard conditions for them and for electrochemical devices when you say standard conditions what that means is that all solutions are at 1 molar concentration Chiriqui was solutions and all gasses are at 1 atmospheric pressure and usually measured them at room temperature which is 25 degrees Celsius OK and we finished up by saying that the relationship between delta G of the reaction is given by the negative and have you sell if it's something non-standard conditions the free interchangeably given by this if it's under standard conditions than the free energy change is given by the United Celtic right and
then we moved on to talk about so that's the relationship between free energy and that's all potential since Wall take self-sticking manager was spontaneous reaction Delta G is always negative and it got to do is negative you can see that overall the cell potential comes out to be a positive effect now having said that we live and went on to say that the window cell potential is what we measured using the old Maeda is convenient for us to break up the potential into 2 parts and to assign the contribution that comes from the Arnold half as well as the captain half right and so when we assign values to the contribution that comes from the capital and we call it the standard production potential so this is that the contribution that comes from each electrode separately so we call this the standard reduction potential 8 for standard electrode potential are right and the symbol we it is the OK and of course the unit is balls so it turns out that you can have a table of values and so this is what this table shows so this is an example of a table the of standard reduction potentials and we're right the use of all in the form of a reduction only and the reason we do that it is the analogy is just like member we said that when you do it acids we always list only the K values if we needed KB values we just converted it KB and we know what the KB value that corresponds to conduct invasive that weak acid that I had acid we can figure that out likewise we have a table of only 1 values and those are listed as a reduction of the so-called standard reduction potentials are right now is an oxidation all we have to use rumors that reaction all right because when you right critical the top equation you have fluorine plus 2 electrons can lead to a minus electrons are being picked up that's a reduction never reversed that reaction to that to a mindless things you have to plus electron now electrons being lost to see that and so did I wanted the the oxidation all I would have to do is reversed the the equation and if you reversed the equation then you change the signs on the reduction potential a cape and so it turns out that the tables that have the standard reduction potentials of every conceivable half reaction that we can encounter and these I usually list so that the reduction potential starters starts the largest positive values and keeps decreasing as you go along all right and you can see the largest positive values the top at the bottom of the have the largest negative value all right and this is the typical standard reduction potential table so what this gives you is that the contribution that a single electoral what capital for example would give know the cell potential is made up of 2 components and therefore if we want to sell
potential than we know that the cell potential it is given as follows the service potential under standard conditions would be this summer but the contributions that comes to the capital plus we need to add the contribution cut that come from the annual wherever these tables always listed as a reduction in the and you have an oxidation so what I need to do is that to flip the signing so that now I have the contribution that comes and Duracell why that native side you have to add the contribution that come to the capital to the contribution that comes from the but because these tables are always listed as a reduction for the oxidation half where the antidote where the oxidation takes place we need to reverse that equation we to words that sign and therefore the negative signs that can reverse that became so example and if I take an example of this so notation so we have this cell that we're looking at where we had in the 2 plus 2 equals and the G plus Equus PG solid and that's saying a cell potential that we experimentally measure under standard conditions is 1 . 2 4 so this celebration tells us that this is the end of remember we always went beyond the 1st so this is the end and this is the capital therefore myself potential should equal the contribution that comes from the capital a right which we know as the Catalan plus we have to flip the size and the cell potential that comes from the end of it are right and therefore I can say at the capital of the redox couple at the capital's is always the reduction remember when you write I redox couple user guide aligned always the oxidised form for areas and reduced form so that would be the cat plants on this side of the river said but now I would write the redox couple at the end of which should be that so this would be the contribution that comes from the cathode this will be the contribution that comes from the annual side I wanted a figure that out I can go to this table Over here and we'll start with the capital is the silver so that's where the reduction takes place so on this table I'm going to look for silver going to silver solid case here you can see that that comes out to be the receiver the value is 0 . 8 0 2 from this table I think get the contribution that comes from the capital which is 0 . 8 0 so this would be 0 . 8 0 volts and you wanted to keep track of signs that would be a positive value plus now I need to look at the contribution that comes from iron iron 2 plus so now I go to this list and look what I to apply and I think this is fine here we are so this is the contribution that comes from the other reaction which it is this is the oxidation parts of this is the reduction reaction so I need to take this value which is negative and so I'm going to flip the signs so that now this is plus 0 . 4 4 all right so that was you said that on the table it was a negative value and flip the sign so now you can see I with 1 . 2 4 walls which is the value that I measures are right and so you can figure out what the cell potential would be under standard conditions by taking the 2 halves of the electrodes and them together keeping in mind that there is a reduction of the cathode and as opposition at the end of that I wanted to write an equation that represented the same thing I could also write this in the form of an equation and so I will start with the captors categories where the reduction takes place so that the Catalonia I have silver plus going to silver so I have EEG plus the quest going start picking up electron giving you AG solid and the reduction potential that corresponds to their would be that AG plus kg redox couple which gives plus 0 . 8 0 ball at the end old I would have the oxidation and so for the oxidation I have irons solid going to 2 plus 2 plus 2 electrons today and this represents the redox couple I am 2 plus iron In since this is an oxidation 92 reversed the sign I take the value from the table which is negative . 4 4 and I'm going to flip the sign so that end up with that OK now give you 1 look at the overall reaction you can see that electrons and went off therefore I need to pick
up 2 electrons so you can see I need to multiply this equation by 2 because there are some limits the number of electrons not have to equal the number of electrons taken out and therefore the balanced equation for this would be to a plus 8 Quest 1st iron solid giving me 2 it solid plus iron to class and since then added these 2 places together and now I give the cell potential which in this class .period 8 0 volts plus 0 . 4 4 balls which is 1 . 2 4 walls guys that are either yes or no so I yes I think you should switch to sign right away our rights because others will forget it right he should be switching as soon as you look at it because very often students if they keep it until usually forget to do that OK don't even mind Roma last time we said reduction potentials so potential that intensive properties What is that India would depend on the amount of substance that supplied by multiplying his 1st equation to multiply it by a provision to denounce the number of electrons in a given up but I do not multiply despite 2 it was free energy change free energy I would multiplied by 2 to understand that it was changing and about the I would multiplied by 2 because they are extensive properties but here we know that some potentials and reduction potential standard that potentials are intensive property don't depend on the amount of subsidy battle will multiply by 2 which is acted together OK now I want to remind you guys that these reduction potentials can't be measured I right but we can measure areas In reality Justice out potential so how do we assign values have been reassigned relative values for the relative contributions that the intellectual contributions if we can't measure are right and when we do that it will be the standard and standard is the hydrogen electric sold by default as standard it is the hydrogen electrode and if you take the hydrogen electoral the standard reduction potential so the hydrogen electrode the redox couple is age plus going to H 2 and this is assigned a value of 0 ball all right so that we start with that and know that we start with the now we take a cell that has a hybrid-electric so let's say we take zinc solid zinc two-plus requests giving me H class inquest H 2 platinum solid we take this and now we can measure the cell potentially turns out if you measure the cell potential standard conditions you can measure this experimentally it comes out to be . 7 6 Wall I write so this is . 7 6 holes then we know that the cell potential Is this summer the cathode so I can go to his age class H 2 the Dutch couple plus or minus R O which is designed to plus zinc redox couples all right so I I know that it's a plus point 7 6 balls I know that the hydrogen electrode is the standards and assign a value of 0 to that class this is a negative sign plus times they didn't want to be a negative it gives me this equation if I rearranged as you can see there if I take this redox couple at the end of I know this comes out to be . 7 6 loss all right so because 100 military has a value of 0 now I have a reduction potential for busy couple I remember since I was a negative side here to account for the what I get here exactly the reduction reaction all right and so return to the table that I showed you now you can see the ideas and molded so what that in yellow and highlighted the standards so the hydrogen electrode has a reduction potential of 0 now based on the fact that this is already assigned a value of 0 use that as a standard now if I go to the zinc couple that we just looked at which is where zinc and that look at this table here we the Minnesota the calculated values 0 . 7 6 balls and we figure that out there signing we can measure the cell potential give hydrogen electrode there you assign a value of 0 and from that we can figure out what the value is for the zinc couples are right now that I know that it's not a good thing now I can take for Daniel cell so you can see this is the way to mix and match and find the right combinations that you can assign values to everything so now that I know that there's a
couple is negative .period 7 6 walls no I go to the Daniels and then sell is 2 plus requests copper solids Copper two-plus actually equals compass solid right and if you measure the cell potential for them as it comes out to be 1 . 1 0 all right so now I moved to the Daniel salad and now I know the value for this is negative 7 . native . 7 6 I could figure out what that is so now I don't listen I can say save you not sell equals the catalog is copper to class copper combination plans In a flip the sign for the reduction potential for zinc which is Inc 2 plus zinc couple I and so I know this value is 1 . 1 0 waltz right this is what we wanna find copper now and then flipped assignment where previously found out that this was negative . 7 6 and therefore I take that value now becomes positive . 7 6 balls right there for mine copper see 2 plus EU redox couple would have a reduction potential of 1 . 1 0 walls minus . 7 6 balls which comes to be turned out to be something like 12 . 3 4 so this will be a plus 0 . 3 4 walls all right so now that I know that you can go to the table and he returned to this table and we look for the copper to plus copper value you can see that comes out to be positive . 3 4 walls so do is understand how we figure out because we can't experimentally measure reduction potentials because the Gallic cell has comes as 1 unit you can't separate the capital from the end the have to be together by assigning 1 of these electrodes the standard of 0 Everything else can be measured relative to that are right and it turns out that these were not on the reduction potentials are listed in Table so some tables look like this I just want to point out that there are different kinds of tables so you see I don't know if you go to CIA the handbook you see the reduction potential Senate action potentials listed out of every conceivable half reaction that you can encounter so there feel like this US and always listed in this order start with the highest positive value goes to 0 and then goes to the highest negative value obtained another way that they're listed it's like and in some books using that US an over here they actually give you the redox couple all right so the list the redox couple and somebody asked me when list out when you have each processor you see here are you list of age plus because this reaction takes place the value that you measure shown here is when that solution is a city in the reaction takes place you can take place in acidic solution of basic solution and so you'll see when this reaction takes place in acidic solution H plus listed OK then there's another 1 here this is under severe conditions and so on if whenever the reaction is and acidic conditions you see that the hydrogen is listed in the redox couples right and so 1 way to figure it out it's just look at the table are right and these are the redox couples on 1 side you can see the reduction half reactions and over here you can see that the reason that some of these have you have to indicate whether the Citicorp basically conceded that these voltages repentant needs all right and the voltage that you list will depend on the pH of the solution and that's why you have to indicate that the city could be 6 right so if it does depend on the pH you'll see those values listed as well OK and that's why you have to indicate 8 plus but those in railways in most cases you do not have to include the each plus all which minus it's only those that depend on the pH the voltage will depend on the reduction potentials will depend on the pH all right so here's another way it's listed and once again you can see that 0 is in the middle OK now there is 1 problem you look at the worksheet there is 1 problem here that I just worked without looking at the problem but you can see the standard action potential for the zinc electrode is theirs and a standard potential for this salad is 1 . 1 0 balls and this is member is the Daniel what is the standard potential for the cop electorate that's just what we just calculated and then so you can encounter questions where had given the cell potential in a given 1 of capital that an order potential already reduction potential free the Qatar and initially able to figure out where the reduction potential for the other is
warranted given that table you can look up the standard reduction potentials and you can calculate the cell potential you would measure if you put those 2 halves together again no no more want to looking at 1 of the most important applications of these tables that we have of the standard reduction potentials and so look at the significance of a standard reduction potentials for alright the significance of Standard reduction potentials and sometimes we call this electrochemical series of all right and I want to remind you that this electrochemical series Is the table that we just look at his table of production potentials standard reduction potential sordid by Starting from the highest standard reduction potential value the highest positive value going down to 0 and then negative number is going to be the highest negative number OK now the standard at the chemical series of very similar to a table of K E values replicate values that implicated values I used to rank relative acid based straps so you know that you can look at the table and you can rank assitance based on which is a stronger acid which is a weaker acid and which is a stronger base and weaker base all right likewise we can use the electrochemical series of this table of standard reduction potentials to rank substances based on whether their strong oxidizing agent or stronger reducing agent located in order to do this I have had a hand in the class website and I would like you print it out and really studying I'm looking is often sold understand was so let's take a look at where make as big as possible there so remedies are all reactions that are written in the form a reduction OK so these are standard reduction potentials so when the substance undergoes a reduction so I think the top equation this is in the form of This Is the substance that undergoes a reduction when a substance go undergoes a reduction in what kind of agent is inevitable in the office an oxidizing agent because it's the agent that's responsible for oxidizing its partners are right so this is the 1 that undergoing the reduction in undergoing the reduction is the oxidizing agent are so on the left-hand side would have In the way that reaction is written you have the oxidizing agent on the right-hand side will reflect that reaction around a reduction reaction of becomes not oxidation so if I take the reverse reaction sell the fall reaction and this would be the oxidizing agent if I reverses reaction I floated around now then is undergoing a reduction are right I'm sorry it's undergoing an oxidation this is undergoing a reduction this will undergo an oxidation because when this reacts to give you this is producing electrons can see that and therefore the reverse reaction this would be the 1 that undergoes oxidation for the reverse reacted this is undergoing oxidation than it is the reducing agent the receiver so when you write these reactions have reactions in the form of a reduction in the on the left-hand side is the oxidizing agent for the forward reactions and anything that's on the product side on the right-hand side is a reducing agent for the reverse reactions are so we can write this in this general former reaction where you have yet the oxidizing agent the oxidizing agent can pick 1 or more electrons to give you the reducing agent are right and the forward reaction this is the oxidizing agent for the reverse reaction this is the reducing agent guidance so now you take these tables away and they are ready and is there anything that has a large positive production potential we have the strongest oxidizing agent on this side all right so if you look at the ranking on the left-hand side In this table as you go further and further out it becomes a stronger and stronger oxidizing agents to never see them and ended the way you look at his look at the reduction potential anything that has a large positive value would be a strong oxidizing agent the left-hand side than something below right so you might want to compare oxidizing agents you can see that on comparing the cost of chlorine and cultural which would be a stronger oxidizing agent to
everything them now you are given for compounds you given this this this and this all right so this is the reactant product reactant Potter and you're asked to weigh these in terms of strongest oxidizing agents to the weakest oxidizing agent security this would be the strongest oxidizing agent this will be the next strongest now on the other side these actually reducing agents but can you see that the order would be your ranking them going from oxidizing agent disease are reducing agents with ranking them he said this is the strongest next overcome this natural come that an annex would come back to see them because this is a strong reducing agent with the strong reducing agent that has to be really weak oxidizing agent to see that and therefore you around all 4 of these bits of me the 1 next comes this Mexicans that and Mexicans that if not given these junior just after ranking to said this is the strong oxidizing agent this will be the weaker ones are right and regular like 3 or 4 compounds to compare what you do is you look at this table and you make sure that the standard reduction potentials listed that starts from the largest positive values and decreases and you know that that would be the strong oxidizing agent again now if you look at reducing agents and members reducing and you have to look at the oxidation so on this side Now this is going this way in the reverse direction and these are all reducing agent alright but not the strongest reducing agent would be down here and the weakest reducing agent will be up there some civility and reducing agents the reaction has been oxidation and for the oxidation anything on the right-hand side of the lost 1 will be the strongest reducing agent and ending on top would be the weakest reducing agents sell if you were given Copper chlorine copper this and as you can see that copper will be the strongest reducing agent next comes this next comes this and next comes at you see that the ranking them in terms of reducing agents the strongest oxidizing agent with the weakest reducing agent see that and therefore if your ranking and this would be the stronger 1 thing comes that then comes back and that would be the last 1 a or if you just looking at only these than anything at the lower end would be a strong reducing agent and that we will be producing region Duracell and so you just see this visually In this world then it helps you when you given a question about the ranking compounds in terms of which will be a strong oxidizing agent but which revealed oxidizing agents but which will be a stronger reducing agent all you have to do is have this picture in mind and that helps you locate and so what you do you make use of electrochemical series and this with electrochemical series are electrochemical series is just the table Table listing our production potential starting from the largest positive value and just decreases you go down into can use this and you understand just like we can rank acids using a K E values we can rank oxidation reduction reactions on the on the basis of oxidizing agents of reducing agents using electrochemical series as well as a kid so now let's take some examples of applying this so this handout on the class website examples that were working on so but don't copy this because you can't is printed out right would apply what we just learned a itself is innocent by commanded solution of more powerful oxidizing agent then in acidified dichromate solution under standard conditions case so here we are using some words and names of compounds that you haven't encountered before but you need to know all about her mandate means an Encino this laboratory as well this is from 1988 fire but NCR C R 2 0 7 2 minus is called the dichromate iron OK so what we're looking for in our ranking is the Zionist so they want to know whether the command a solution is his more powerful oxidizing agent then died from its solutions and remedies of 1 of those examples of reactions that actually depend on the pH and that's why they tell you to so over the replied this then we have to turn to the left chemicals and so on the electrochemical series we now have to look for permitting time OK so we look for the relative position of the commanding iron there's magnetic on in acidified solutions are right and you can see that the reduction potentials plus 1 . 5 1 No that's 1 of our reactants I write what is the other 1 look for dichromate right there so you can see that in ending on top on the left-hand side should be a oxidizing agent than anything below so between permanent and dichromate which is a strong oxidizing agent for many itself the answer being yes magnate is a stronger oxidizing agent the dike coming because an electrochemical series it goes on top or you can look at the reduction potentials and you can see that from 1988 has a larger positive standard reduction potential than we dichromate and therefore you absolutely yes all right now let's take a 2nd example also visited a straightforward yes or no or if you're asked to rank them he would rank manganese is a strong oxidizing agent that provided never go to the 2nd 1 and I'm perversely taking them much more ease your questions but I just wanted to take some examples where some yeah it's a little bit more there's a pH dependence as well and so once again let's take another example now this is a little more complicated over so let's take a look at the candidate was key the 4 we used to oxidized iron to 2 5 3 under standard conditions in acidic solutions to the next question is slightly more different were asked we used him at 0 4 2 oxidized iron to to find 3 so if if I wanted to use chairman of Ford of oxidized and which is the oxidizing agent who is oxidizing if I say it's all in the wording OK I'm not saying kid I'm is undergoing oxidation and sinking Emanuel for his oxidizing so if chairman of Ways oxidizing Ryan who is undergoing the oxidation I am so who is undergoing the reduction came of 4 or if Kaymer Nova was undergoing the reduction is that the oxidizing agent was reducing agent oxidizing agent you got it so it's all in the wording and students get thrown off so you gotta read a couple of times because they're asking you can't hear in for oxidized iron to 2 I'm 3 so that means I am to and I 3 oxen being oxidized so that's the oxidation differ came at a faster rate of reduction in different chairman of 4 has to be the oxidizing agents right so when you studying make sure you clarify whether the wording yes they can use the word oxidation which is different from oxidizing which is different from oxidizing agents oxidizing agent an oxidizing go together all right oxidizing Hayward oxidizing is the same as oxidizing agent or oxidizing something else oxidation and reduction a different battle so make sure you clarify when you read the question itself so would with Italian says Ken came in 4 after the oxidizing agent for iron too defiant 3 itself let's go
back to the table and you have who can answer this question without looking at electrochemical series so that remaining 8 it's got a large standard reduction potential now I have to look Ireland into going to find 3 so this is here we are this is the redox couple I'm 3 I to remedy this is the reduction therefore this has to be the observations of this equation actually workers so you have time to plus going to I'm 3 all right said by companies to which is a strong oxidizing agent this is a strong oxidizing agent this is the weaker on stronger reducing agent this would be the weaker oxidizing agent to see them so that means if any on top we're looking at is electrochemical series in on top will always under the reduction and anything below that will always go oxidation see of rumors that OK so what would you answer the wooded oxidized iron tree at wooded oxidized iron to trade yes because forces strong oxidizing agent no 1 should they ask you to write a balanced equation acknowledged that look at how we write advanced equation so we know therefore the top equation we know that this is what happens at the capital so we know the cathode is the site of the reduction and we know that oxidizing agent will undergo reduction itself and I know this would be a plus 1 . 5 1 OK so this is the capital it's undergoing a reduction of cake now what happens at the end of day it's the oxidation so now going to go down to I 3 plus I'm to you have to be careful when you look at the series because you can have I'm 3 going to I'm too you can have 3 going to iron them all right and you can have time to going to I'm never to see that you have to make sure people at this table you pick appropriate 1 so here we are looking at I'm going from a trip charged to I'm too lost the look at oxidation so I have to do to this equation after Rivers said so by reversing now I would have in the 2 plus OK if the 2 plus that giving me if the 3 plus plus an electron and this would be now I need to reverse that signs so this will be negative . 7 7 bowls all right so that when a combined them to look at the overall reaction side electrons are given off so how many do I need to multiply this by 5 some bounced equation would be mn 0 4 minus plus 8 h plus plus 5 if the 2 plus would give me mn 2 plus 2 plus 4 H 2 0 0 plus 5 if the 3 plus and myself potential would be plus 1 . 5 1 walls plus negative . 7 7 balls and that would be the overall self potential for that reaction you understand that I write so that you can use the cathode plus flipped sign for the annual or you can just flip the sign right then added together and you end up with the overall potential that you would expect for that set up a game or now we can move on sell so you should expect questions where you're asked to rank relative oxidizing agents or more importantly you should be able to give a whole list of substances elements or on you should be able to rank them in terms of relative oxidizing agents or relative strands of reducing agents will pick the 1 that would be the strongest oxidizing agent or pick the 1 that is the strongest reducing agent but it's OK now I wouldn't want to be looking at the relationship between standards potentials and equilibrium constants so wouldn't look at the relationship between V Standard cell potential and the equilibrium
constant case of well OK so willing to derive an expression for the relationship between the standards potential an equilibrium constants that because amendment that would endowments when we look at free energy what is the relationship between free energy and equilibrium constant because remedies equation that will derive last quarter Delta Jean reaction equals minus R T L and K alright so this gives you the relationship between the equilibrium constant and the 3 United all right now we know that Delta gene on reaction is also an he not sell for the free energy under standard conditions is related to the south potential according to this equation so that I take this and put it over there I can see it in their units sell he also negative party Alan King the to negative signs will cancel out any side so I can say that he not sell the calls Our over Indiana right times Ellen case alright so this is the relationship between the till now if you look at the as members see there are is a constant Saturday constant if we keep the temperature constant at room temperature then these values constants all right so right so I can be the right this this way or I want to remind us that I also want to remind you that we can right this equation this way if everyone account itself potential the relationship it is up attention Alan K. will be given by that if I want a Catholic Ellen Keyes Ellen came with the end over Archie ln King right so depending on size the nod sell right so I can write these equations in the way 1 of these we know that our is a constant so you can see that the this and as these terms as long as your room temperature these terms will remain the same so art remember is 8 . 3 1 falsified Jules prick Calvin crumble the Farid constant is 9 . 6 4 8 5 times 10 to the power of for "quotation mark once per mole temperatures member most them calculation that at 25 degrees Celsius which is considered to be room temperature and at 25 degrees Celsius in Tempe absolute temperature and Calvin would be 298 . 1 5 Calvert City 1 at 273 . 1 5 if you really want to be precise then it would be who at room temperatures of the 298 . 1 5 Calvert now it might take all of this and put them together then it turns out that party Over half would be 0 . 0 2 5 6 9 3 volts all right so that means this equation now can be written as if you wanna captured the self potential this would be 0 . 0 2 5 6 9 3 2 holes divided by and Ellen King and this equation would be Ellen Hale calls it and was 0 0 2 5 6 9 3 balls he not sell this year so what this equation gives you Is is the relationship between the cell potential and the equilibrium constant so you can calculate the equipment constant given the cell potential vice-versa city set up a galvanic cell and you measure the cell potential under standard conditions meant the company could in constant right and so
I will stop there for today and next will take an example where where applying this equation event
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Altern
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Oxidschicht
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Chemische Forschung
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Gibbs-Energie
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Delta
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Chemischer Prozess
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Dipol <1,3->
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Calciumhydroxid
Wässrige Lösung
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Alaune
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Internationaler Freiname
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Filmscharnier
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Gang <Geologie>
Elektron <Legierung>
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Dichromate
Gesundheitsstörung
Krankheit
Azokupplung
Elektrochemisches Verfahren
Säure
Uranerz
Cupcake
Magnetisierbarkeit
Krankheit
Manganerz
Chemisches Element
Redoxsystem
Zelle
Hausmittel
Reaktionsführung
Zuchtziel
Genexpression
Graphiteinlagerungsverbindungen
Galvanisches Element
Computeranimation
Aktionspotenzial
Gen
Derivatisierung
Körpertemperatur
Gibbs-Energie
Wildbach
Elektronegativität
Alkoholgehalt
Krankheit
Gleichgewichtskonstante
Sieb
Hydroxybuttersäure <gamma->
Besprechung/Interview

Metadaten

Formale Metadaten

Titel Lecture 20. Electrochemistry Pt. 5.
Serientitel Chemistry 1C: General Chemistry
Teil 20
Anzahl der Teile 26
Autor Arasasingham, Ramesh D.
Lizenz CC-Namensnennung - Weitergabe unter gleichen Bedingungen 3.0 USA:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen und das Werk bzw. diesen Inhalt auch in veränderter Form nur unter den Bedingungen dieser Lizenz weitergeben.
DOI 10.5446/19009
Herausgeber University of California Irvine (UCI)
Erscheinungsjahr 2013
Sprache Englisch

Inhaltliche Metadaten

Fachgebiet Chemie
Abstract UCI Chem 1C General Chemistry (Spring 2013) Lec 20. General Chemistry Electrochemistry, Part 5 Instructor: Ramesh D. Arasasingham, Ph.D. Description: UCI Chem 1C is the third and final quarter of General Chemistry series and covers the following topics: equilibria, aqueous acid-base equilibria, solubility equilibria, oxidation reduction reactions, electrochemistry; kinetics; special topics. Index of Topics: 0:03:29 Review of Cell Potential 0:06:06 Standard Reduction Potential of Standard Electrode 0:13:15 Finding Cell Potential Example 0:26:13 Significance of Standard Reduction Potentials 0:38:02 Can Aqueous KMnO4 Oxidize Iron? 0:44:49 Standard Potentials and Equilibrium Constants

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