1.

Calculate the standard electrode potential of Cu^(+)//Cu half cell. Given that the standard reduction potentials of Cu^(2+)//Cu and Cu^(2+)//Cu^(+) are 0.337V and 0.153V respectively.

Answer»

Solution :Given: (i) `Cu^(2+)+2e^(-)toCu,E^(@)=0.337V,""DeltaG_(1)^(@)=-2xxFxx0.337J`
(ii) `Cu^(2+)+e^(-)toCu^(2+),E^(@)=0.153V,""DeltaG_(2)^(@)=-1xxFxx0.153J`
Aim: `Cu^(+)+e^(-)toCu,DeltaG_(3)^(@)=?`
(i)-(ii) gives the REQUIRED RESULT, i.e., `DeltaG_(3)^(@)=DeltaG_(1)^(@)-Delta_(2)^(@)=[-674-(0.153)]F=-0.521F`
`therefore-nFE_(Cu^(+)//Cu)^(@)=-0.521F` or `E_(Cu^(+)//Cu)^(@)=0.521V(becausen=1)`.


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