calculating standard reduction potential for a reaction

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calculating standard reduction potential for a reaction

Post by nickname » Thu Nov 11, 2010 10:50 pm

I have to calculate the standard reduction potential for the reaction Cu(III) to Cu(II).

the following info is given and it says that I have to use the formula delta G= -nFE

1. CU3+ + 2e- ---> Cu+ E1= 1.28V

2. CU2+ + e- ---> Cu+ E2= 0.15V

3. Cu2+ + 2e- ----> Cu(s) E3= 0.34V

3. Cu+ + e- ----> Cu (s) E4= 0.52V

Should I use #s 1 &3 and do 1.28+ - 0.34= 0.94V

Then delta G = -2(96.5kj/mol)(0.94v)= -181.42?

It says that I should conver each E (i have to pick the correct ones) to delta G and then sum all the delta G values and finally convert the sum back to an E value.

If anyone could help me I will greatly appreciate it!

Thank you!

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Inland Taipan
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Post by JackBean » Mon Nov 15, 2010 8:16 am

just pick those reactions, which you can sum to Cu3+ -> Cu2+ reaction ;)

Cis or trans? That's what matters.

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