pseudo first order

Question

Hydrolysis of ethyl acetate in presence of excess water follows pseudo first-order kinetics because:

RankGuru · Accepted Answer

Reaction: $CH_3COOC_2H_5 + H_2O \xrightarrow{H^+} CH_3COOH + C_2H_5OH$
- The experimental rate law is $	ext{Rate} = k [CH_3COOC_2H_5] [H_2_O]$.
- When **water is in large excess**, its concentration does not change significantly during the reaction.
- Thus, $[H_2O]$ can be considered constant and absorbed into the rate constant: $	ext{Rate} = k_{obs} [CH_3COOC_2H_5]$, where $k_{obs} = k[H_2O]$.
- Such a reaction, which is higher order but behaves as first order, is called a **Pseudo First-Order Reaction**.

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More pseudo first order Practice Questions

Hydrolysis of ester in large excess water shows pseudo first-order because: