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At what concentration of copper sulphate...

At what concentration of copper sulphate solution, the potential of `Cu^(2+)`, Cu becomes zero? The standard reduction potential of `Cu^(2+)`, Cu is 0.34 V.

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`E = E^(@) +(0.059)/(n) log C ` (or)
`0=0.34+(0.059)/(2) log [Cu^(2+)]`
`0.0295 log [Cu^(2+)]=-0.34`
(or) `log[Cu^(2+)]=- (0.34)/(0.0295) = -11.57`
`[CuSO_(4)]=10^(-11.57) = 10^(-12+0.43) = 2.9xx10^(-12)M`.
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