Question

10 g fairly concentrated solution of $CuS{O}_4$ is electrolyzed using 0.01 F of electricity. Calculate:
(a) The weight of resulting solution(g) (write the value to the nearest integer).

Answer 1

(a) The elctrolysis is carried out using platinum electrodes.
0.01 F of electricity will deposit $0.01\times \frac{159.6}{2}=0.8g$ of Cu.
The mass of liberated oxygen will be $0.01\times \frac{32}{4}=0.08g$
Hence, the wight of the resulting solution will be $10-0.8-0.08=9.12g$
(b) However if the electrolysis is carried out using copper electrode, then there will be no change in the mass of the solution.