Why Does the Colour of Copper Sulphate Solution Change When an Iron Nail is Dipped in It?
Explanation of the Chemical Reaction:
When an iron nail is placed in a copper sulfate solution, a chemical displacement reaction occurs. During this reaction, iron displaces copper from the copper sulfate solution.
Displacement Reaction:
The iron nail reacts with the copper sulfate (CuSO4) to form iron sulfate (FeSO4) and free copper metal. This reaction is represented by the following equation:
Fe + CuSO₄ → FeSO₄ + Cu
As a result, the blue colour of the copper sulfate solution fades, and a green colour appears due to the formation of iron sulfate, which is green in colour.