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Question
State your observation At the cathode, when acidified aqueous copper sulphate solution is electrolysed with copper electrodes.
Solution
Acidified aqueous copper sulphate solution is electrolysed with copper electrodes by electrolysis. The electrolysis of an aqueous solution of copper sulphate using copper electrodes (i.e. using active electrodes) results in the transfer of copper metal from the anode to the cathode during electrolysis. The copper sulphate is ionized in aqueous solution.
Copper sulphate solution is ionised by the following chemical equation:
`CuSO_4 ->Cu^(2+) + SO_4^(2+)`
The positively charged copper ions migrate to the cathode, where each gains two electrons to become copper atoms which are deposited on the cathode.
`Cu^(2+) + 2e^(-) -> Cu`
Hence, the color of copper sulphate changes from blue to colorless.
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