Example Question 2

Edexcel AS-level ChemistryOxidation and ReductionLesson 7 of 14

Question: Iron(III) ions react with iodide ions in aqueous solution:

2 Fe³⁺ (aq) + 2 I⁻ (aq) → 2 Fe²⁺ (aq) + I₂ (aq)

(a) Use oxidation numbers to state which species is oxidised and which is reduced. (b) Identify the oxidising agent and the reducing agent. (c) Write the two half-equations.

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oxidising agent: A substance that accepts electrons from another species, causing it to be oxidised, while it is itself reduced.
reducing agent: A substance that donates electrons to another species, causing it to be reduced, while it is itself oxidised.
oxidation number: A number assigned to an atom showing its degree of oxidation, based on the electrons it would gain or lose if all bonds were ionic.