Question
A weak acid is $ 0.1\% $ ionised in $0.1\, M $ solution. Its $pH$ is
✓
Answer
For a monobasic acid
$[{H^ + }] = C\alpha $
$ = \frac{1}{{10}} \times 0.001 = {10^{ - 4}}$ $⇒ pH = 4$
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