Medium
What is a pseudo first order reaction? Give an example of a pseudo first order reaction.
(N/A) pseudo first order reaction is a reaction that is actually of a higher order (usually second order) but behaves as a first order reaction under certain experimental conditions,such as when one reactant is present in a large excess.
Example: The acid-catalyzed hydrolysis of ethyl acetate $(CH_3COOC_2H_5 + H_2O \xrightarrow{H^+} CH_3COOH + C_2H_5OH)$.
In this reaction,the concentration of water is in such a large excess that it remains effectively constant throughout the reaction. Therefore,the rate law becomes $Rate = k[CH_3COOC_2H_5][H_2O] \approx k'[CH_3COOC_2H_5]$,where $k' = k[H_2O]$.
Example: The acid-catalyzed hydrolysis of ethyl acetate $(CH_3COOC_2H_5 + H_2O \xrightarrow{H^+} CH_3COOH + C_2H_5OH)$.
In this reaction,the concentration of water is in such a large excess that it remains effectively constant throughout the reaction. Therefore,the rate law becomes $Rate = k[CH_3COOC_2H_5][H_2O] \approx k'[CH_3COOC_2H_5]$,where $k' = k[H_2O]$.
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