OCR A Jun 2010 Paper 5 Q2

Answers available below

In the presence of acid, H+(aq), aqueous bromate(V) ions, Br O3 ions, Br(aq), to produce bromine, Br2(aq). (aq), react with aqueous bromide A student carried out an investigation into the kinetics of this reaction. (a) Balance the ionic equation for this reaction. Br O3+ Br + H+ Br2 + H2O [1] (b) The student investigated how different concentrations of Br O3 reaction. (aq) affect the initial rate of the A graph of initial rate against [Br O3 (aq)] is shown below. initial rate / mol dm3 s1 [BrO3 (aq)] / mol dm3 The student then investigated how different concentrations of Br(aq) and H+(aq) affect the initial rate of the reaction. The results are shown below. (aq)] [Br O3 / mol dm3 5.0102 [Br(aq)] / mol dm3 1.5101 [H+(aq)] / mol dm3 3.1101 initial rate / mol dm3 s1 1.19105 5.0102 3.0101 3.1101 2.38105 5.0102 1.5101 6.2 x 101 4.76105OCR 2010<br /> Using the results from the students experiments, what conclusions can be drawn about the kinetics of this reaction? Justify your reasoning.Calculate the rate constant for this reaction, including the units. In your answer you should make clear how your conclusions fit with the experimental results.[9]OCR 2010 [Total: 10] Turn over<br />

Show answer