A-Level AQA Chemistry Kinetics: Bromate(V) ions and bromide ions

Question

Bromate(V) ions and bromide ions react in acid conditions according to the equation

BrO3-(aq) + Br-(aq) + 6H+(aq) → 3Br2(aq) + 3H2O

A series of experiments was carried out at a given temperature. The results were used to deduce the rate equation for the reaction.

rate = k [BrO3-][Br-][H+]^2

Table 2 shows an incomplete set of results.

| Experiment | Initial [BrO3-] / mol dm^-3 | Initial [Br-] / mol dm^-3 | Initial [H+] / mol dm^-3 | Initial rate of reaction / mol dm^-3 s^-1 |
|------------|-------------------------------|----------------------------|--------------------------|----------------------------------------|
| 1          | 0.10                          | 0.20                       | 0.30                     | 2.4 × 10^-2                          |
| 2          | 0.20                          | 0.30                       | 3.6 × 10^-2              |
| 3          | 0.20                          | 0.10                       | 0.27                     |
| 4          | 0.10                          | 0.10                       | 2.7 × 10^-2              |

Use the data from Experiment 1 to calculate a value for the rate constant, k, at this temperature and give its units.

Bromate(V) ions and bromide ions react in acid conditions according to the equation BrO3-(aq) + Br-(aq) + 6H+(aq) → 3Br2(aq) + 3H2O A series of experiments was carried out at a given temperature - AQA - A-Level Chemistry - Question 5 - 2018 - Paper 2

Worked Solution & Example Answer:Bromate(V) ions and bromide ions react in acid conditions according to the equation BrO3-(aq) + Br-(aq) + 6H+(aq) → 3Br2(aq) + 3H2O A series of experiments was carried out at a given temperature - AQA - A-Level Chemistry - Question 5 - 2018 - Paper 2

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