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

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Iron is more reactive than copper. It displaces copper from copper sulphate solution according to the following reaction:

Thus, as copper sulphate reacts to form iron(Il) sulphate, the blue colour of copper sulphate solution fades.

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