Question

why does the colour of copper sulphate solution change when an iron nail is dipped ​

Answer 1

Hey!

Colour of copper sulphate solution changes from blue to faded green beacause Iron displaces copper from copper sulphate solution as iron is more reactive than Copper.

Hope this helps ✌✌

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)