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When an iron nail is placed in a blue copper sulphate solution, the blue colour gradually fades because the concentration of which ion decreases?

Answer and explanation

Correct answer: Copper(II) ion

The blue colour of copper sulphate solution is due to copper(II) ions. Since iron is more reactive than copper, it displaces copper(II) ions from the solution to form copper metal: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). Thus, the concentration of copper(II) ions decreases and the blue colour fades. Iron(II) ions are formed, but they are not the ions whose decrease causes the fading.

Related tags

ScienceClass10Chemical ReactionsDisplacement ReactionCopper SulphateMetal Reactivity

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