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A student writes the reaction on placing an iron nail in aqueous copper sulfate solution as: \(2Fe + 3CuSO_4 \rightarrow Fe_2(SO_4)_3 + 3Cu\). What correction is required in the equation?

Answer and explanation

Correct answer: The product should be \(FeSO_4\); the correct equation is \(Fe + CuSO_4 \rightarrow FeSO_4 + Cu\).

Iron is more reactive than copper, so it displaces copper from copper sulfate solution. In this reaction, iron normally forms \(Fe^{2+}\) ions; therefore, the salt formed is ferrous sulfate, \(FeSO_4\): \(Fe + CuSO_4 \rightarrow FeSO_4 + Cu\). Option A correctly refers to the relative reactivity, but \(Fe_2(SO_4)_3\) contains iron in the \(Fe^{3+}\) state and is not the product of this usual displacement reaction.

Related tags

Chemical ReactionsChemical EquationsDisplacement ReactionReactivity SeriesCopper SulfateIron

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