In it impure metal is madeanode and strip of pure form of same metal is made cathode Aqveous solution of slat of sme metal is taken as electryle. Ion passing electric current metal ion form the electrlyte are deposited at calthode in the form of pure metal while an equivalent amount of metal dissolves form anode and goes into electyrolye soltuion as metal ions ex electrolytic refining of cupper .
