CIE Jun 2013 v3 Paper 4 Q2

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Examiners For Use Ethyl ethanoate is hydrolysed slowly by water in the following acid-catalysed reaction. CH3CO2CH2CH3 + H2O H+ CH3CO2H + CH3CH2OH The concentration of ethyl ethanoate was determined at regular time intervals as the reaction progressed. Two separate experiments were carried out, with different HCl concentrations. The following graph shows the results of an experiment using [HCl ] = 0.1 mol dm3. [CH3CO2CH2CH3] / mol dm3 0.20 0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 20 40 60 time / min 80 100 120 (a) When the experiment was carried out using [HCl ] = 0.2 mol dm3, the following results were obtained. time / min [CH3CO2CH2CH3] / mol dm3 0 10 25 50 75 100 125 0.200 0.160 0.115 0.067 0.038 0.022 0.013 (i) Plot these data on the axes above, and draw a line of bestt.UCLES 2013 9701/43/M/J/13<br /> Examiners For Use (ii) Use one of the graphs to show that the reaction isrst order with respect to CH3CO2CH2CH3. Show all your working, and show clearly any construction lines you draw on the graphs. (iii) Use the graphs to calculate the order of reaction with respect to HCl. Show all your working, and show clearly any construction lines you draw on the graphs. (iv) Write the rate equation for this reaction, and calculate the value of the rate constant. rate = [7] (b) (i) Why is it not possible to determine the order of reaction with respect to water in this experiment?(ii) Although [CH3CO2CH2CH3] decreases during each experiment, [HCl ] remains the same as its initial value. Why is this?[2]UCLES 2013 9701/43/M/J/13 [Total: 9] [Turn over<br />

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