Question

Why does the blue colour of copper sulphate fade away gradually during elctrolysis​

Answer 1

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)

Answer 2

Answer:

Explanation:

Copper Chloride solution is blue in color. But during this process, the blue color gradually fades away because copper chloride is being broken down. The solution becomes acidic becomes acidic because hydrochloric acid is formed.