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A student places a clean iron nail in a blue copper sulphate solution. Which observation after some time confirms that a displacement reaction has occurred?

Answer and explanation

Correct answer: The solution turns green and a reddish-brown copper coating forms on the nail

Iron is more reactive than copper in the reactivity series, so it displaces copper from copper sulphate: \(\mathrm{Fe + CuSO_4 \rightarrow FeSO_4 + Cu}\). The iron sulphate formed makes the solution green, and the displaced copper deposits as a reddish-brown coating on the nail. In option B, an unchanged blue solution would not indicate this displacement reaction.

Related tags

Displacement ReactionReactivity SeriesCopper SulphateIron NailChemical Reactions

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