Question

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

Answer 1

when iron nails are dipped in copper sulphate solution , the colour of the solution changes from blue to light green.
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reason -

iron reacts with copper to form FeSO4 which is green in colour.
iron lies above copper in activity series of metals so it can displace copper from copper sulphate.

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the reaction -
2Fe + CuSO4 ------> FeSO4 + Cu

Answer 2

Explanation:

When an iron nail is dipped in copper sulphate solution,

• brown coating of copper is formed on the surface of iron
• the colour of copper sulphate solution changes from blue to light green.

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