Question 38
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?

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Solution

(a) Anode: Impure silver metal, Cathode: Pure silver metal
(b) The aqueous solution of a silver salt like ${AgNO}_{3}$ can be used as an electrolyte.
(c) Pure silver gets deposited at the cathode, because, at the cathode, ${Ag}^{+}$ ions will accept electrons and undergo reduction.
${Ag}^{+} (aq) + e^{-} \to Ag(s)$

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Electrolytic Refining

Standard X Chemistry

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(a) Anode: Impure silver metal, Cathode: Pure silver metal (b) The aqueous solution of a silver salt like AgNO3 can be used as an electrolyte. (c) Pure silver gets deposited at the cathode, because, at the cathode, Ag+ ions will accept electrons and undergo reduction. Ag+(aq)+e−→Ag(s)