Question

Explain, why during the electrolysis of copper sulphate using copper electrodes, the colour of solution does not fade.

Answer 1

During the electrolysis of aqueous copper sulphate using copper electrodes, copper ions are generated at the anode, that go into the copper sulphate solution used as electrolyte. Next, the copper ions from the electrolyte are deposited at the cathode. Therefore, for each copper ion discharged at the cathode, a copper ion is generated at the anode. Thus, the number of copper ions in the copper sulphate solution remain the same. Due to this, there will be no change in the intensity of the blue colour of the copper sulphate solution.