First slide

Ionization constants of weak bases, PH of weak bases

Question

The pH of a weak mono basic acid is 5. The degree of ionisation of acid in 0.1 M solution is

Easy

A

10^-2
B

10^-3
C

10^-4
D

10^-1

Solution

P^H of weak monobasic acid is 5
$5 = \frac{1}{2} [P^{Ka} - {logC}_{0}]$
$\Rightarrow 10 = P^{K_{a}} + 1 \Rightarrow P^{K_{a}} = 9 \Rightarrow K_{a} = 10^{- 9}$
degree of ionisaiton of a weak acid is given as
$α = \sqrt{\frac{K_{a}}{C_{0}}} = \sqrt{\frac{10^{- 9}}{10^{- 1}}} = 10^{- 4} (or) [H^{+}] = Cα; α = \frac{10^{- 5}}{10^{- 1}} = 10^{- 4};$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App