Explain the refining of copper by electrolysis.

For refining of copper by electrolysis, impure copper rod is arranged as anode and rod of pure copper as cathode.

The aqueous solution of copper sulphate is taken as electrolyte.

When electric current is passed through the electrolyte the proportion of which copper from anode is dissolved in aqueous solution of copper sulphate and the same amount of copper from electrolyte is deposited on cathode.

Copper deposited on cathode is of 100% purity.