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What is E^(c).(red) for the reaction: Cu...

What is `E^(c)._(red)` for the reaction`: Cu^(2+)+2e^(-) rarr Cu` in the half cell `Pt_(S^(2)|CuS|Cu)`. if `E^(c-)._(Cu^(2+)|Cu)` is `0.34V` and `K_(sp)` of `CuS=10^(-35)`?

A

`0.34V`

B

`-0.6925V`

C

`+0.6925V`

D

`-0.66V`

Text Solution

Verified by Experts

The correct Answer is:
b
`E_(S^(2-)|CuS|Cu)=E^(c-)._(Cu^(2+)|Cu)+(0.059)/(2)log K_(sp)CuS`
`=0.34+(0.059)/(2)log10^(-35)=-0.925V`
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