Question

The solution of nickel sulphate in which nickel rod is dipped is diluted to 10 times. The potential of nickel

• A. Decreases by 60 mV
• B. Increases by 30 V
• C. Decreases by 30 mV
• D. Decreases by 60 V

Answer 1

Answer: (C)

$N{i}^{2+}+2e^{-}\to Ni$
$E=E^0+\frac{0.059}{2}log\frac{\left[N{i}^{2+}\right]}{\left[Ni\right]}$
$=E^0+\frac{0.059}{2}log1\times 10^{-1}$
$=\left(E^0-0.03\right)volts$