What is the $\mathrm{pH}$ of a solution containing $2.2 \times 10^{-6} \mathrm{M}$ hydrogen ions?

What is the $\mathrm{pH}$ of a solution containing $2.2 \times 10^{-6} \mathrm{M}$ hydrogen ions?
  1. 6.34
  2. 5.66
  3. 4.34
  4. 3.80

Solution

$\begin{aligned} \mathrm{pH}=-\log _{10}\left[\mathrm{H}_3 \mathrm{O}^{+}\right] & =-\log _{10}\left[2.2 \times 10^{-6}\right] \\ & =6-\log _{10}(2.2)=6-0.34 \\ & =5.66\end{aligned}$

Asked in: MHT CET 2023 (09 May Shift 2)

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