Chemistry 9701 · AS & A Level · States of matter

States of matter — practice question

Bromate(V) ions, $\text{BrO}_3^{-}$, react with bromide ions in acidic conditions to form bromine.
(a)[2]

Write the ionic equation that represents this reaction.

(b(i))

Use the table data to work out the order with respect to each reactant. Show how you reached your answer.

(b(ii))

Write the rate equation that applies to this reaction.

(b(iii))[6]

Use the results from experiment $1$ to calculate the rate constant, $k$, for this reaction. Include the units for $k$.

(b)

The initial rate for this reaction was measured using different starting concentrations of the three reactants. The results are shown below.

Worked solution & mark scheme

This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: Accurate redox equation $\text{BrO}_3^- + 5\text{Br}^- + 6\text{H}^+ \rightarrow 3\text{Br}_2 + 3\text{H}_2\text{O}$

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