In the acid hydrolysis reaction: A + + H+ - Products, where [H+] = 0.1 M and is present in large excess, the apparent rate constant is 1.5 × 10^-5 s^-1. rate = K [A] [] [H+] = K_appl [A]. The true ra

Question

In the acid hydrolysis reaction: A + $H_2O$ + H+ -> Products, where [H+] = 0.1 M and $H_2O$ is present in large excess, the apparent rate constant is 1.5 × 10^-5 s^-1. rate = K [A] [$H_2O$] [H+] = K_appl [A]. The true rate constant (third-order rate constant) of reaction is

Prashant Kotian · Accepted Answer

Correct answer: C. K_appl = K * [] * [H+]. For pure water, [] = 55.5 M. [H+] = 0.1 M. Thus, 1.5 × 10^-5 = K * 55.5 * 0.1 = 5.55 * K => K = (1.5 × 10^-5) / 5.55 = 2.7 × 10^-6 M^-2 s^-1.

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