Explain briefly.
Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
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Explain briefly.
Iron is more reactive than copper. So iron nail replaces copper from copper solution. Thus copper solution loses it’s characteristic colour.
CuSO4 + Fe –> FeSO4 + Cu
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 colour of copper sulphate solution is blue. When an iron nail is dipped in the solution of copper sulphate, it forms ferrous sulphate solution and copper metal by the displacement of copper from the solution.
The colour of ferrous sulphate is green. That’s why the solution becomes green.