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During extraction of metals, electrolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
Answers (1)
Ans. (a)
Electrolytic refining is a process of refining a metal by the process of electrolysis.
Impure metal is made anode and is connected to the positive terminal of battery. Pure metal is made cathode and is connected to the negative terminal of the battery.
(a) Cathode: Thin strip of pure silver (It is connected to the negative terminal of the battery).
Anode: Impure, silver block (It is connected to the positive terminal of the battery).
(b) Electrolyte: any salt solution of silver like AgNO3 or AgCl,
but sodium argentocyanide (Na[Ag(CN)2]) is preferred.
(c) Pure metal from the electrolyte deposits on the cathode.
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