First slide

PH of weak acids and weak bases

Question

The pH of a weak monobasic acid is 3. It is diluted by 100 times, its pH of resulting solution will be

Moderate

A

4
B

5
C

6
D

2

Solution

P^H of a weak acid solution is given as, $P^{H} = \frac{1}{2} [P^{K_{a}} - {logC}_{0}]$
Initially the P^H =3 $\Rightarrow 3 = \frac{1}{2} [P^{K_{a}} - {logC}_{0}] \to (1)$
After dilution, $P^{H} = \frac{1}{2} [P^{K_{a}} - \log \frac{C_{0}}{10^{2}}] \to (2)$
$(1) - (2) \Rightarrow 3 - P^{H} = \frac{1}{2} [P^{K_{a}} - \log \frac{C_{0}}{10^{2}}]$
P^H = 4

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