Question

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Answer 1

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When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.

Answer 2

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Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

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When an iron nail dipped in the copper sulphate solution, iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore the colour of the copper sulphate solution changes. The reaction is:

Fe + CuSO4 → FeSO4 + Cu