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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Similar Questions
Acid catalysed hydrolysis of ethyl acetate follows a pseudo-first order kinetics with respect to ester. If the reaction is carried out with large excess of ester,the order with respect to ester will be
For an elementary reaction,which of the following is correct?
The results given in the below table were obtained during kinetic studies of the following reaction:
$2 A + B \longrightarrow C + D$
Experiment $[A] / mol \ L^{-1}$ $[B] / mol \ L^{-1}$ Initial rate / $mol \ L^{-1} \ min^{-1}$ $I$ $0.1$ $0.1$ $6.00 \times 10^{-3}$ $II$ $0.1$ $0.2$ $2.40 \times 10^{-2}$ $III$ $0.2$ $0.1$ $1.20 \times 10^{-2}$ $IV$ $X$ $0.2$ $7.20 \times 10^{-2}$ $V$ $0.3$ $Y$ $2.88 \times 10^{-1}$
$X$ and $Y$ in the given table are respectively :
$2 A + B \longrightarrow C + D$
| Experiment | $[A] / mol \ L^{-1}$ | $[B] / mol \ L^{-1}$ | Initial rate / $mol \ L^{-1} \ min^{-1}$ |
| $I$ | $0.1$ | $0.1$ | $6.00 \times 10^{-3}$ |
| $II$ | $0.1$ | $0.2$ | $2.40 \times 10^{-2}$ |
| $III$ | $0.2$ | $0.1$ | $1.20 \times 10^{-2}$ |
| $IV$ | $X$ | $0.2$ | $7.20 \times 10^{-2}$ |
| $V$ | $0.3$ | $Y$ | $2.88 \times 10^{-1}$ |
$X$ and $Y$ in the given table are respectively :
DifficultJEE MAIN 2020
View SolutionWhich among the following statements is $NOT$ true about rate constant?
$A + B \rightarrow \text{product}$. The rate of this reaction is given by $v = K[A]^2[B]^0$. What is the change in the rate of reaction when the concentration of $A$ is doubled and the concentration of $B$ is doubled?
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