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Why is the ester hydrolysis slow in the ...

Why is the ester hydrolysis slow in the beginning and becomes faster after sometimes?

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The ester hydrolysis takes place as follows `:`
`underset(Ester)(RCOOR')+underset(Water)(H_(2)O)hArrunderset(Ac i d)(RCOOH)+underset(Alcohol)(R'OH)`
The acid produced in the reaction acts as catalyst `(` autocatalyst `)` for the reaction.Hence, the reaction becomes faster after some time.
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