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)

Decreases by 30 mV

Answer 2

$Ni^{2+} + 2e^{-} \to Ni$ $E = E^{0} + \frac{0.059}{2} log \frac{\left[Ni^{2+}\right]}{\left[Ni\right]}$ $= E^{0}+ \frac{0.059}{2} log\, 1\times10^{-1}$ $= \left(E^{0} - 0.03\right) volts$