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ICSE Class 10 Answered

In electrolysis of aqueous copper sulphate using copper electrode we see that elctrons from copper anode gets transferred to copper cathode.So can we use any other electrolyte instead of CuSO4?Since we can't see any special use of CuSO4.Explain the reason.
Asked by | 19 Oct, 2013, 12:50: PM
Expert Answer

The electrolysis of an aqueous solution of copper sulphate using copper electrodes results in transfer of copper metal from the anode to the cathode during electrolysis. The copper sulphate is ionised in aqueous solution.

 
               CuSO4  ?  Cu2+  +  SO42-

Cathode Reaction:

The positively charged copper ions migrate to the cathode, where each gains two electrons to become copper atoms that are deposited on the cathode.

 
               Cu2+     +   2e-   ?   Cu     

Anode Reaction:

At the anode, each copper atom loses two electrons to become copper ions, which go into solution.

 
               Cu   ?   Cu2+     +   2e-     

The sulphate ion does not take part in the reaction and the concentration and colour of the copper sulphate in solution does not change.

 

Answered by Karishma Kapoor | 21 Oct, 2013, 11:31: AM
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