Displacement reactions as redox reactions

2 marks · Hard

Write the balanced ionic equation, including state symbols, for the reaction that occurs when chlorine gas is bubbled through a solution containing sodium bromide. Do not include spectator ions.

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2Br^−(aq) + Cl_2(aq) → 2Cl^−(aq) + Br_2(aq)

Also accept: 2Br^-(aq) + Cl_2(aq) → 2Cl^-(aq) + Br_2(aq)

Common mistakes: Including sodium ions or other spectator ions; Incorrect balancing or missing state symbols

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Marking points

M1 · 1 mark · Correctly writes out the reactants and products for the displacement (including correct ions).

A1 · 1 mark · Includes correct state symbols for all species and omits spectator ions.

Worked solution

Chlorine displaces bromide ions to form bromine and chloride ions.