Question

In a pseudo first order acid catalysed hydrolysis of ester in water the following results were obtained:
t/s 0 30 60 90
[ester]/M 0.55 0.31 0.17 0.085
Which of the following is/are correct for the given reaction?

• A. The average rate of reaction between time interval 30 to 60 seconds is $4.67\times {10}^{-3}mol{L}^{-1}{s}^{-1}$
• B. Order of reaction is 2.
• C. Pseudo first order rate constant for the acid catalysed hydrolysis of ester is $1.92\times {10}^{-2}{s}^{-1}$
• D. All are correct.

Answer 1

Answer: (A), (C)

The correct options are
A The average rate of reaction between time interval 30 to 60 seconds is $4.67\times {10}^{-3}mol{L}^{-1}{s}^{-1}$
C Pseudo first order rate constant for the acid catalysed hydrolysis of ester is $1.92\times {10}^{-2}{s}^{-1}$

$rat{e}_{avg}=0.14/30=4.67\times {10}^{-3}$
$\therefore k=1.92\times {10}^{-2}$