First slide

PH of weak acids and weak bases

Question

The pH of 10^–3M mono acidic base, if it is 1% ionised is

Moderate

A

5
B

8
C

3
D

9

Solution

$α = \sqrt{\frac{K_{b}}{C_{0}}} \Rightarrow K_{b} = C_{0} α^{2} \Rightarrow K_{b} = 10^{- 3} \times {(10^{- 2})}^{2} = 10^{- 7}$
P^OH of a weak base solution is given by,
$\Rightarrow P^{OH} = \frac{1}{2} [P^{K_{b}} - {logC}_{0}]$
$\Rightarrow P^{OH} = \frac{1}{2} [7 + 3] = 5$
P^H = 14 – 5 = 9.

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