(i) Given below are the steps for extraction of copper from its ore. Write the reaction involved.
(a) Roasting of copper(I)sulphide
(b) Reduction of copper(I)oxide with copper(I)sulphide.
(c) Electrolytic refining.
(ii) Draw a neat and well-labelled diagram for electrolytic refining of copper.

The steps for extraction of copper from its ore

a) Roasting: Copper glance (Cu2S) is roasted in the presence of air. $2Cu_{2} S( s) +3O_{2}( g) \ \rightarrow 2Cu_{2} O( s) +2SO_{2}( g)$

b) Reduction: Copper oxide is then heated in the absence of air. Reduction of copper (I) oxide with copper (I) sulphide:

$2Cu_{2} O+Cu_{2} S\rightarrow 6Cu( s) +SO_{2}( g)$

This reaction is known as auto -reduction.

(c) Reaction for electrolytic refining: The impure copper metal is made ANODE and the pure metal of copper is CATHODE copper sulphate as an electrolyte. Pure copper from electrolyte deposited on cathode soluble impurities goes into solution and insoluble impurities remain in the solution and deposited at bottom of ANODE.
$At\ anode\ :\ Cu^{2+}( aq) +2e^{-}\rightarrow Cu( s)$
$At\ cathode\ :\ Cu( s) \ \rightarrow Cu^{2+}( aq) +2e^{-}$

(ii) A neat and well-labeled diagram for electrolytic refining of copper.
 

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Updated on: 10-Oct-2022

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