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Question

Estimate the standard reduction potential for the copper/copper sulphide electrode.
For CuS,Ksp=8.5×1036,ECu|Cu2+=0.34 V.

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Solution

Ksp(CuS)=8.5×1036
We know,
Anode : Cu+SCuS+2e
Cathode : Cu2++2eCu––––––––––––––––––
over all : Cu2++SCuS
Ecell=0=E00.0591nlog[CuS](Cu2+)(S)
E0=0.05912log1Ksp
[ECu/CuS+ECu2+/Cu]=0.05912logKsp
0.34ECu/CuS=0.05912log(8.5×1036)
0.34ECu/CuS=1.0363
ECu/CuS=0.697

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