Question

A SOLUTION OF CUS4 IS ELECTROLYSED USING A CURRENT OF 1.5A FR 10 MIN WHAT IS THE MASS OF CU DEPOSITED AT CATHODE

Answer 1

A solution of CuSO4 is electrolysed for 10 minutes with a current of 1.5 amperes. What is the mass of copper deposited at the cathode?
t = 600 s
Charge = current x time
= 1.5 A x 600s = 900 C
According to the reaction : Cu2+(aq) + 2e– → Cu(s)
We require 2F or 2 x 96487 C to deposit 1 mol or 63 g of Cu
For 900 C, the mass of Cu deposited =
(
63

g

mol
−
1

×

900

C
)
2

×

96487

C

mol
−
1

=

0
.
2938

g
.
(63 g mol-1 × 900 C)2 × 96487 C mol-1 = 0.2938 g.