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  4. The pH of 0.001( N ) acetic acid solution, which is 10 % dissociated. is

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Q. The pH of $0.001( N )$ acetic acid solution, which is $10 \%$ dissociated. is

AIIMSAIIMS 1996Equilibrium

Solution:

Concentration of acetic acid $=0.001 \,N$ for $10 \%$ dissociation,

the effective concentration of $H ^{+}$ is one-tenth of total concentration.

Therefore concentration $=\frac{1}{10} \times 0.001\, N$

$=0.0001\, N$

$\Rightarrow \,\,\,pH = -\log \left[ H ^{+}\right]=4$