First slide

PH of weak acids and weak bases

Question

The dissociation constant (K_a) and percent of degree of dissociation ( $α$ ) of a weak monobasic acid solution of 0.1M with a pH = 5 are respectively.

Easy

A

10^-9, 1
B

10^-9, 10^-4
C

10^-9, 10^-2
D

10^-5, 10^-2

Solution

$[H^{+}] = C_{o} α = \sqrt{K_{α} C_{o}} \Rightarrow 10^{- 5} = 10^{- 1} \times α \Rightarrow α = 10^{- 4}$
Also; $K_{a} = C_{o} α^{2} = 10^{- 9}$
Percentage degree of dissociation = $α \times 100 % = 10^{- 2} %$

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