Question

Au3+(aq) + 3e- --> Au(s) 1.498 V Ag+(aq) + e- --> Ag(s) 0.767 V Cu2+(aq) +...

Au3+(aq) + 3e- --> Au(s)

1.498 V

Ag+(aq) + e- --> Ag(s)

0.767 V

Cu2+(aq) + 2e- --> Cu(s)

0.342 V

Ni2+(aq) + 2e- -->Ni(s)

-0.257 V

Calculate the potential at 25ºC for the following cell:

Cu | Cu2+ [0.024M] || Ag+ [0.0048M] | Ag

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Answer #1

Cu | Cu2+ [0.024M] || Ag+ [0.0048M] | Ag


Cu(s) -------------------> Cu^2+ (aq) + 2e^-     E0 = -0.342v

2Ag+(aq) + 2e------------->2 Ag(s)                   E0 = 0.767v

---------------------------------------------------------------------------------------

Cu(s) + 2Ag^+ (aq) ---------> Cu^2+ (aq) + 2Ag(s) E0 cell = 0.425v

       n = 2

Ecell   = E0 cell -0.0592/n logQ

           = E0 cell -0.0592/n log[Cu^2+]/[Ag^+]^2

            = 0.425 -0.0592/2 log0.024/(0.0048)^2

            = 0.425-0.0296*3.0177   = 0.34V >>>>answer

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