The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is 1/100th of that of a strong acid (HX, 1M), at 25°C. The Ka of HA is

Engineering

Chemistry

Pseudo Order Reaction

pH Calculation for Acids and Bases

Question

The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is 1/100^th of that of a strong acid (HX, 1M), at 25°C. The K_a of HA is

1 × 10^–5

1 × 10^–3

1 × 10^–4

1 × 10^–6

LiveFree JEE Main Previous Year Online Papers Live Free JEE Advance Previous Year Online Papers

College PredictorLive

Know your College Admission Chances Based on your Rank/Percentile, Category and Home State.

Get your JEE Main Personalised Report with Top Predicted Colleges in JoSA

Rate = K [Ester] [H⁺]

For strong acid [H⁺] = 1M

For weak acid [H+] = $\sqrt{K_{a} . C}$

$\frac{{Rate}_{1}}{{Rate}_{2}} = \frac{{[H^{+}]}_{1}}{{[H^{+}]}_{2}}$

$\frac{1}{1 / 100} = \frac{1}{\sqrt{K_{a} \times 1}}$

K_a = 10^–4 M