Question

23.
A 0.02 M acid HA is 40% dissociated. The
equilibrium constant ka for the acid is​

Answer 1

Answer:

Acid -base reaction is as follows:

HA+H

2

O→H

3

O

+

+A

−

Given, degree of dissociation (α)=40%=0.4

For weak acid, hydronium ion concentration is

[H

3

O

+

]=Cα=0.2×0.4=0.08