First slide

Acidic buffer

Question

In an acidic buffer solution (pH = 4.4), the concentration ratio of acid and salt is 2 : 1. The value of dissociation constant of weak acid may be

Easy

Solution

P^H of an acidic buffer is given as
${P^H} = {\text{ }}{P^{{K_a}}} + \log \frac{{\left[ {salt} \right]}}{{\left[ {acid} \right]}}$
⇒ 4.4 = P^K_a + log $\large \frac{1}{2}$
⇒ P^K_a = 4.7
⇒ K_a = 2 x 10^-5

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