Question

In an acidic buffer solution ph is equal to 4.4 the concentration ratio of acid and salt is 2 is to 1 the value of dissociation constant of weak acid maybe

Answer 1

The dissociation constant of the weak acid is 2 x 10⁻⁶

We know that ,

pH = pKᵃ + log[base/acid]

where ,

pKᵃ = - logKᵃ

and Kᵃ is called the dissociation constant.

So from the given data we get,

4.4 = pKᵃ + log[1/2]

=> 4.4 = pKᵃ - 0.3

=> pKᵃ = 4.7

=> - log Kᵃ = 4.7

=> Kᵃ = 10⁻⁴°⁷

= 1/50118

=> Kᵃ ≅ 2 x 10⁻⁶

Answer 2

your answer is 2*10^-5