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Why does the blue colour of copper sulphate solution fade when zinc is added?

Answer and explanation

Correct answer: The concentration of copper(II) ions in the solution decreases.

The blue colour of copper sulphate solution is due to copper(II) ions. Zinc is more reactive than copper, so it displaces copper from copper sulphate in a displacement reaction: \(\mathrm{Zn + CuSO_4 \rightarrow ZnSO_4 + Cu}\). The concentration of blue copper(II) ions decreases, so the blue colour fades. Sulphate ions remain in the solution and are not responsible for the colour change.

Related tags

ScienceClass10Chemical-ReactionsDisplacement-ReactionCopper-SulphateZinc

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