Science
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
Chemical Reaction
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Answer
When an iron nail is dipped in a copper sulphate solution, iron being on top of copper in the metal reactivity series displaces copper from copper sulphate solution and forms iron sulphate, which is green in colour.
Fe (s) + CuSO4 (aq) ⟶ FeSO4 (aq) + Cu (s)
Hence, the colour of copper sulphate solution changes when an iron nail is dipped in it.
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