Question

Explain why it is preferable to use a number of graphite electrodes as anode instead of a single electrode, during the above electrolysis.

Answer 1

During the electrolysis process, aluminium is deposited at the cathode and oxygen is liberated at the anode. Some of the oxygen reacts with the carbon in the graphite to form carbon dioxide. by consuming the anode slowly. Thus, the anodes have to be replaced periodically or a number of graphite electrode as anodes have to be used.