CBSE Class 10 Answered

 Electrolytic refining of copper:

 

In the process of electrolytic refining of copper, the electrolyte used is acidified copper sulphate.

Impure metal is made as an anode and pure metal is made as a cathode.

On passing the electric current through the electrolyte, the impure metal from anode dissolves into the electrolyte solution

and pure metal from copper sulphate solution deposits on the cathode.

 At Anode:  Cu → Cu²⁺  + 2e^-

 

At Cathode: Cu²⁺  + 2e^- → Cu

The soluble impurities go into the solution and insoluble impurities settle down at the bottom of an anode and are known as anode mud.