First slide

Ionization constants of weak bases, PH of weak bases

Question

If the ionisation constant of acetic acid is $1.8 \times 10^{- 5}$ at what concentration will it be dissociated to 2%?

Moderate

A

I M
B

0.018 M
C

0.18 M
D

0.045 M

Solution

${CH}_{3} COOH ⇌ {CH}_{3} {COO}^{-} + H^{+}$
Initial C 0 0
$at equil C (1 - α) Cα C α$
$K = \frac{Cα \cdot Cα}{C (1 - α)} = \frac{{Cα}^{2}}{1 - α} = {Cα}^{2}$
or, $C = \frac{K}{α^{2}} = \frac{1.8 \times 10^{- 5}}{(0.02)^{2}} = 0.045 M$

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