Question

$10g$ fairly concentrated solution of $CuS{O}_4$ is electrolysed using $0.01$ faraday of electricity. Calculate the mass of the resulting solution.

• A. $7.6025g$
• B. $9.6025g$
• C. $6.6025g$
• D. $77.6025g$

Answer 1

The correct option is B $9.6025g$

$C{u}^{2+}$ + $2e^{-}$ $\to$ $Cu$

so, 1 faraday deposits 0.5 mole of $Cu$

0.01 faraday deposits $Cu$ = $0.5\ast 0.01$ = 0.005 mole

1 mole of $Cu$ = 63.5 g

0.005 mole = 0.3175 g of $Cu$

so, the mass of resulting solution = $10-0.31$

the mass of resulting solution= 9.6