Q. Consider the following statements, The rate law for the acid catalysed hydrolysis of an ester being given as $Rate = k\left\lbrack H^{+} \right\rbrack\lbrack ester\rbrack = k^{'}\lbrack ester\rbrack$. If the acid concentration is doubled at constant ester concentration 1. The second order rate constant, k is doubled. 2. The pseudo first order rate constant, k is double. 3. The rate of the reaction is doubled. Which of the above statements are correct?
A) 1 and 2
B) 2 and 3
C) 1 and 3
D) 1,2 and 3
Explanation
(b)
Pseudo first order rate constant is doubled as well as rate of reaction is doubled. It may be noted that in presence of acid, hydrolysis of ethyl acetate is a pseudo-unimolecular reaction but the actual value of k depends upon the concentration reaction but the actual value of k depends upon the concentration of $H^{+}$ions, otherwise rate constant of a reaction is constant at constant temperature.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.