First slide

PH of weak acids and weak bases

Question

The pH of 1.2% (w/v) aqueous solution of CH₃COOH at 25⁰C is (pK_a = 4.7)

Moderate

A

5.0
B

9.26
C

2.7
D

2.9

Solution

Concentration of CH₃COOH solution is 1.2% w/v
In 1000 ml of solution, $m_{{CH}_{3} COOH} = 12 g (OR) n_{{CH}_{3} COOH} = \frac{12}{60} = 0.2$
M = 0.2
P^H of a weak acid solution is given as
, $P^{H} = \frac{1}{2} [P^{K_{a}} - {logC}_{0}] = \frac{1}{2} [4.7 - \log 2 + 1] P^{H} = \frac{1}{2} [5.7 - 0.30] P^{H} = 2.7$

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