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

What is the concentration of $\mathrm{H}_3 \mathrm{O}^{+}$ions in a solution having $\mathrm{POH}$ value 9 ?
  1. $1.0 \times 10^{-5} \mathrm{M}$
  2. $2.0 \times 10^{-5} \mathrm{M}$
  3. $1.5 \times 10^{-5} \mathrm{M}$
  4. $2.5 \times 10^{-5} \mathrm{M}$

Solution

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

Asked in: MHT CET 2022 (07 Aug Shift 1)

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