The rate constant for forward reaction and backward reaction of hydrolysis of ester are 1.1 x 10-2 and 1.5 x 10-3 per minute respectively.

Equilibrium constant for the reaction is

CH3COOC2H5 + H2O ⇌ CH3COOH + C2H5OH

CH3COOC2H5 + H2OCH3COOH + C2H5OHRate constant for forward reaction = 1.1×10-2 min-1Rate constant for backward reaction = 1.5×10-3 min-1Equilibrium constant =rate of forward reactionrate of backward reaction=1.1×10-21.5×10-3=7.33

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Equilibrium constant is ratio of forward rate and backward rate. So it must be 11/1.5
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