The
impure copper is made an anode that dissolves on passing current
and pure copper is deposited at the cathode Many metals like Na, Mg,
Al, etc are produced on large scale by electrochemical reduction of
their respective cations where no suitable chemical reducing agents
are available for this purpose Sodium and magnesium metals are produced by the electrolysis of
their fused chlorides and aluminium is produced by electrolysis of
aluminium oxide in presence of cryolite