Question

Why is the ester hydrolysis slow in beginning and fast after sometime?

Answer 1

Answer:

In ester hydrolysis, an acid and alcohol are formed as the products. For example, Acid will release H+ ions in solution which act as catalyst (auto-catalysis) for the reaction. That is why, the hydrolysis is slow in the beginning and becomes faster later on.

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Answer 2

Answer:

after a while some amount of alcohol is formed which acts as a catalyst hence the reaction rate is increased