Explanation
Initially, rate = k [A][B] = kab
When volume of the vessel is reduced to one-fourth, concentrations become
4 times. Hence new rate = k (4a) (4b) = 16 kab i.e. it becomes 16 times.
In presence of acid, hydrolysis of ethyl acetate is a pseudo-unimolecular reaction but the actual value of k depends upon the concentration of H+ ion. As H2SO4 is stronger acid than HCl and moreover H+ ions produced from 0.05 M H2SO4 is double than those produced from 0.05 M HCl, therefore k2 >> k1 or k1 < k2
Pseudo first order rate constant is doubled as well as rate of reaction is doubled. It may be noted that in presence of acid, hydrolysis of ethyl acetate is a pseudo-unimolecular reaction but the actual value of k depends upon the concentration of H+ ions, otherwise rate constant of a reaction is constant at constant temperature.
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