Q22 / 150 · MHT CET 2022 (07 Aug Shift 1) · Chemistry

What is the concentration of $\mathrm{H}_3 \mathrm{O}^{+}$ions in a solution having $\mathrm{POH}$ value 9 ?

  • Correct answer
    A
    $1.0 \times 10^{-5} \mathrm{M}$
  • B
    $2.0 \times 10^{-5} \mathrm{M}$
  • C
    $1.5 \times 10^{-5} \mathrm{M}$
  • D
    $2.5 \times 10^{-5} \mathrm{M}$

Solution

$\begin{aligned} & \mathrm{pH}=14-\mathrm{poH} \\ & =14-9=5 \\ & \therefore\left[\mathrm{H}^{+}\right]=10^{-\mathrm{pH}}\end{aligned}$ or $10^{-5}$

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

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