A weak monobasic acid is $20 \%$ dissociated in it's $0.01 \mathrm{M}$ solution. What is the dissociation…

A weak monobasic acid is $20 \%$ dissociated in it's $0.01 \mathrm{M}$ solution. What is the dissociation constant of weak acid?
  1. $2.5 \times 10^{-6}$
  2. $3 \times 10^{-6}$
  3. $2 \times 10^{-6}$
  4. $4 \times 10^{-6}$

Solution

$\begin{aligned} & \text { Ka }=\alpha^2 \mathrm{c} \\ & =(0.20)^2 \times 0.01 \\ & =4 \times 10^{-6}\end{aligned}$

Asked in: MHT CET 2022 (05 Aug Shift 2)

Practice more Ionic Equilibria questions on Aicharya