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Question
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Solution
When a zinc rod is dipped in a solution of copper sulphate, zinc, being a more reactive metal than copper, will displace copper from copper sulphate solution. The blue colour of the copper sulphate solution gradually fades due to the formation of the green-coloured zinc sulphate. The red-brown colour of copper will be deposited on the zinc rod.
Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)
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