[macman104]

Hello all,

Since I had success with my first question, I thought I'd try going 2 for 2.  I've attached a word document with the problem and all the mathType work I've done with it so far.  I'm fine for the first part of the question, but the second part has me puzzled.  As before, the book does very little to explain Formal Potential so I googled it.

I gathered that I replaced E⁰ with E^0', but I still needed the E value for the half cell reaction.  I didn't think I could just use the value I found earlier, because the ionic strength of the solution is different which is going to effect my cell.  I'm pretty sure my professor is looking for a more concrete answer than what I managed to manipulate the equation down to for the second part.  Am I missing something?

EDIT:  Oh, btw, I don't know if you need mathtype to view the actual calculations, if that's the case, I can try and do screenshots of the document and put them up.  Let me know.

[Dolphinsiu]

http://en.wikipedia.org/wiki/Formal_potential

This website will tell you about standard electrode potential.

[macman104]

http://en.wikipedia.org/wiki/Formal_potential

This website will tell you about standard electrode potential.

I do appreciate you trying to point me to some information, but I had already googled formal potential, and been to the wiki.  My question wasn't about how to calculate standard electrode potential and what it is, I'm very clear on that.  I wanted to know how I incorporate the information into calculating the activity coefficients.  I don't know if I can use the previous value for the cell that I calculated because they've changed the ionic strength of the solution.  And if I can't, what is my next step?  I'm hoping someone will look at my Word document and either point me in the right direction for further calculation, or tell me I'm going about it wrong and point me in the right direction.

[Dolphinsiu]

http://en.wikipedia.org/wiki/Debye-H%C3%BCckel_equation

This is about activity coefficient and ionic strength!Hope this helps!

[Borek]

Start with standard E₀ - it is given in tables with assumption that all activitity coefficients equal 1. Calculate ionic strength and activity coefficients, insert them into Nernst equation and you are there.

[macman104]

Start with standard E₀ - it is given in tables with assumption that all activitity coefficients equal 1. Calculate ionic strength and activity coefficients, insert them into Nernst equation and you are there.

Hmm, I don't know if I'm not being clear, or if people haven't looked at the problem, or what exactly.  I really do appreciate people posting links and saying "look here" and such, but I've been through wikipedia.  Borek, yes, that would be how to calculate the E_cell but I don't need that.  I need to calculate the ratio of the activity coefficients.

I'm not trying to be rude, as I found this forum and I was ecstatic to see a whole place devoted to chemistry.  However, I can't help but get a little frustrated because it seems like no one has actually read the problem or looked at the attachement, and are just posting links based on what I wrote.  I know how to calculate the E_cell, I am aware of using the Nernst equation, calculating the ionic strength, all of that.  My issue is in where do I make the next move in the equation I am solving in the attachment.

If no one knows, that's cool, no biggie.  However, posting links that honestly don't really solve, answer or shed new light on any part of my question is a little frustrating.