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12. (a) Expt 1 2 3 4 (i) romide, bromate(V) and hydrogen ions react according to the following equation: 6H* (aq) + 5Br (aq) + BrO3 (aq) 3Br2 (aq) + 3H₂O (1) In this reaction, there is a change of conductivity because the number of ions decreases as the products are formed. Therefore, the kinetics of this reaction can be followed by using a conductivity cell. Four experiments were carried out at 25 °C. The results are shown in the table below. Initial conc. of Br/mol dm-3 2.78 x 10-3 1.39 x 10-3 2.78 x 10-³ 2.78 x 10-3 Initial conc. of H*/ mol dm-³ 3.33 x 10-² 3.33 x 10-² 3.33 x 10-² 1.67 x 10-² Initial conc. of BrO3/mol dm-3 1.39 x 10-³ 1.39 x 10-³ 6.9 x 10-4 1.39 x 10-³ Initial rate/ mol dm³ s-¹ 4 2 2 1 Find the order of reaction with respect to each of the following, giving your reasoning. (ii) Write a rate equation for the reaction. (iii) Calculate the rate constant and give its units. [9.28 x 108 mol dmº s-¹] (iv) What conclusion can you draw about the mechanism of this reaction? (v) Suggest another suitable method to follow the reaction in the laboratory.