The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is $1 / 100^{t h}$ of that of a strong acid (HX, 1M), at $25^{\circ} C .$ The $K_{a}$ of HA is

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

$1 \times 10^{- 4}$

$1 \times 10^{- 5}$

$1 \times 10^{- 6}$

$1 \times 10^{- 3}$

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

$r = K [C H_{3} C O O C H_{3}] [H_{2} O] [H^{+}]$

$\frac{r_{H A}}{r_{M X}} = \frac{[H^{+}] from H A}{[H^{+}] from H X}$

$\frac{1}{100} = \frac{[H^{+}] from H A}{1} \Rightarrow [H^{+}] from H A = 10^{- 2} M$

$\underset{1 - 10^{- 2} ≃ 1}{H A (a q)} ⇌_{}^{} \underset{10^{- 2}}{H^{+} (a q)} + \underset{10^{- 2}}{A^{-} (a q)}$

$k_{a} = \frac{10^{- 2} \times 10^{- 2}}{1} = 10^{- 4}$

Watch 3-min video & get full concept clarity

JEE

NEET

Foundation JEE

Foundation NEET

CBSE