Question

The reduction potential of a half-cell consisting of nickel electrode in 0.1 M NiSO₄ solution at 25°C is ____________.

(E⁰ = −0.257 V)

Options

• −0.2274 V

• 0.1978 V

• −0.2866 V

• −0.3162 V

Answer 1

The reduction potential of a half-cell consisting of nickel electrode in 0.1 M NiSO₄ solution at 25°C is −0.2866 V.

Explanation:

Using Nernst equation,

`"E"_"electrode" = "E"^0 - 0.0592/2 log_10  1/(["Ni"^(2+)])`

= `-0.257 - 0.0592/2 log_10  1/0.1`

= 0.257 − 0.0296

= −0.2866 V