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Chemistry Assessed Practical (Skill E) The Calculation of an equilibrium constant The experiment that we did was and esterification, a reaction between ethanoic acid and ethanol to produce ethyl ethanoate. CH3COOH + C2H5OH -->CH3COOC2H5 + H2O This solution was made up and left in a cupboard, undisturbed for 7 days. We then took several 1 cm3 samples and titrated them with NaOH. This would determine the amount of moles of acid in the solution, which include the carboxylic acid left at equilibrium and the HCl which was added to the solution at the start to catalyse the reaction. The results of the titration are below. Start point 0 0 0 0 End point 15 16.5 16.8 16.8 Titre 15 16.5 16.8 16.8 Average titre: 16.7, not including the first titration as this was a rough estimate. The table below shows the amount of each substance at the beginning of the reaction and the equilibrium quantities Stage CH3COOH C2H5OH CH3COOC2H5 H2O Initial 0.2625 0.2576 0 1.1 Equilibrium 0.162 0.0956 0.0956 1.2067 From this we can calculate Kc, Concentration of products / concentration of reactants (0.0956 x 1.2067) / (0.162 x...

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