Question

A solution of copper sulphate (CuSO₄) is electrolyzed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at the cathode (at. mass of Cu = 63 u) is ______.

Options

• 0.3892 g

• 0.2938 g

• 0.2398 g

• 0.3928 g

Answer 1

A solution of copper sulphate (CuSO₄) is electrolyzed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at the cathode (at. mass of Cu = 63 u) is 0.2938 g.

Explanation:

W = Zit

where Z = Electrochemical equivalent

Eq. wt. of copper = `63/2` = 31.5;

Z = `31.5/96500`

W = Zit

= `31.5/96500 xx 1.5 xx 10 xx 60`

= 0.2938 g