Question

Explain why the blue colour of copper chloride fades away gradually during electrolysis?

Answer 1

blue colour fades of copper sulphate solution during electrolysis because there is the separation of copper and the solution (the blue colour of the solution is due to the presence of copper in the solution)

Answer 2

Answer:

The blue colour of electrolyte is due to the presence of copper ions in it. As the electrolysis is . carried out, the copper ions discharge at the cathode.

Cu2+ + 2e–   ⟶   Cu

However, no copper ions enters in the electrolyte from anode. Thus concentration of copper ions goes on decreasing. This result in fading of blue colour. When copper ions completely finish the electrolyte becomes colourless.

Reaction of cathode:

H+ + e–   ⟶   H

H + H   ⟶   H2

Reaction of anode :

OH– – 1e–  ⟶   OH

4OH   ⟶    2H2O + O2(g