Q63 / 200 · NEET 2022 (Phase 2) · Chemistry

$0.01 \mathrm{M}$ acetic acid solution is $1 \%$ ionised, then $\mathrm{pH}$ of this acetic acid solution is :

  • A
    3
  • B
    2
  • Correct answer
    C
    4
  • D
    1

Solution

Ionisation of $\mathrm{CH}_3 \mathrm{COOH}$ is $1 \%$ in aqueous solution. So, $\left[\mathrm{H}^{+}\right]=\frac{1}{100} \times$ concentration of $\mathrm{CH}_3 \mathrm{COOH}$ $\begin{aligned} & =\frac{1}{100} \times 10^{-2}=10^{-4} \\ \mathrm{pH} & =-\log \left[\mathrm{H}^{+}\right]=-\log \left(1 \times 10^{-4}\right) \\ \mathrm{pH} & =4 \end{aligned}$

Hence, the correct answer is option: 'C'.

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