Question

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

• A. $1\times 10^{- 4}$
• B. $1\times 10^{- 5}$
• C. $1\times 10^{- 6}$
• D. $1\times 10^{- 3}$

Answer 1

Answer: (A)

$K_{a}=C\left(\alpha \right)^{2}=1\times \left(\right.0.01\left(\left.\right)^{2}=1\times 10^{- 4}$