What is the $\mathrm{pH}$ of solution containing $\mathrm{H}^{+}$ion concentration $2.5 \times 10^{-3}…

What is the $\mathrm{pH}$ of solution containing $\mathrm{H}^{+}$ion concentration $2.5 \times 10^{-3} \mathrm{~mol} \mathrm{dm}^{-3}$ ? (Given $\log 2.5=0.3979$ )
  1. $2.6$
  2. $3.6$
  3. $3.9$
  4. $5.2$

Solution

$\begin{aligned} \mathrm{pH} & =-\log \left[\mathrm{H}^{-}\right] \\ & =-\log \left(2.5 \times 10^{-3}\right) \\ & =3-\log 2.5 \\ & =3-0.3979 \\ & =2.603\end{aligned}$

Asked in: MHT CET 2022 (10 Aug Shift 1)

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