First slide

Ionization constants of weak acids, PH of weak acids

Question

The pH of 0.001 M acetic acd is

Easy

A

3
B

11
C

Between 3 and 7
D

7

Solution

p^H of a weak acid solution is given by $p^{H} = \frac{1}{2} [p^{K_{a}} - {logC}_{o}]$
$p^{K_{a}}$ value is not given so using the above relation we cannot determine the p^H.
We know, acetic acid (CH₃COOH) is a weak acid and so its P^H should vary between 3-7 strong acids have a p^H below 3.

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