The second-order rate constant for the reaction CH3COOC2H5(aq) + OH−(aq) → CH3CO2−(aq) + CH3CH2OH(aq) is 0.11 dm3 mol−1 s−1. What is the concentration of ester (CH3COOC2H5) after (i) 20 s, (ii) 15 min when ethyl ethanoate is added to aqueous sodium hydroxide so that the initial concentrations are [NaOH] = 0.060 mol dm−3 and [CH3COOC2H5] = 0.110 mol dm−3?

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