Displacement reactions as redox reactions
2 marks · NormalWrite the ionic equation, with state symbols, for the displacement reaction between bromine water and potassium iodide solution.
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Must show: Ionic substances, correct charges, correct state symbols, correct stoichiometry
Also accept:
Common mistakes: Including spectator ions, omitting state symbols, incorrect coefficients
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Marking points
M1 · 1 mark · Correct reactants and products (include ions and molecules); both sides balanced.
A1 · 1 mark · All state symbols correctly given as (aq) for ions and (aq) or (l) for halogens as relevant.
Worked solution
Bromine water reacts with potassium iodide solution. The bromine displaces the iodide ions from solution. Potassium ions are spectator ions and are left out of the ionic equation.