Why does iron displace copper from its salt solution?

Answer:

Fe is more reactive than Cu, hence Fe can displace the Cu from its salt solution.

Displacement reaction

A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. For instance, when iron is added to a copper sulphate solution, it displaces the copper metal.

A + B-C → A-C + B

The above equation exists when A is more reactive than B.

A and B have to be either:

  • Halogens where C indicates a cation.
  • Different metals wherein C indicates an anion.

Reaction of iron displace copper from its salt solution

When iron nails are placed in CuSO4 iron displaces copper from copper sulphate to form ferrous sulphate. The iron nails get deposited with a brownish red substance of the copper metal. The reaction is as follows:

Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)

Metallic iron displaces copper ion (Cu2+) from its salt is an example of a chemical displacement reaction. Metallic iron is converted to ferrous iron, the cupric ion is converted to metallic copper. The reaction is as follows:

Fe(s) + Cu2+(aq) → Fe2+(aq) +Cu(s)

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