Question

why does the color of copper sulphate solution change when an iron nail is dipped in it

Answer 1

Copper sulphate changes into iron sulphate because iron is a more reactive element than copper an thus the solution becomes pale green.

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Answer 2

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When an iron nail dipped in the copper sulphate solution than 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 involved here is:

Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)