12201 12 In 1931 Moelwyn-Hughes and Hinshelwood monitored the decarboxylation of the strong acid A: O2N CO2H NO2 NO2 O2N NO2 NO2 A (aq)  +  CO2(g) (aq) Heat (a) (i) Suggest an IUPAC name for the organic product. [1] (ii) Moelwyn-Hughes and Hinshelwood followed the kinetics of the reaction by titration. Explain how they could have determined the rate of reaction. Include in your answer the names of an alkali and an indicator which could be used. Indicate what steps and graphs would be needed to determine the order of reaction with respect to A. In this question you will be assessed on using your written communication skills including the use of specialist scientific terms. 12201 [Turn over [6] (b) Moelwyn-Hughes and Hinshelwood obtained the following data from their experiments. experiment [A] × 10−4/ mol dm−3 initial rate × 10−6/ mol dm−3min−1 1 2.50 2.40 2 1.67 1.64 3 1.04 1.02 (i) State the order of the reaction. [1] (ii) Using the results from experiment 1 calculate the rate constant, stating its units. [2] (iii) Explain why the rate constant would increase if the experiment was repeated at a higher temperature. [1]