The $\left[\mathrm{H}^{+}\right]$in lemon juice is found to be $0.0063 \mathrm{M}$. What is $\mathrm{pH}$…

The $\left[\mathrm{H}^{+}\right]$in lemon juice is found to be $0.0063 \mathrm{M}$. What is $\mathrm{pH}$ value of lemon juice $(\log 6.3=0.7993)$ ?
  1. 2.8
  2. 3.8
  3. 5.2
  4. 2.2

Solution

$\begin{aligned} \mathrm{pH} & =-\log \left[\mathrm{H}^{+}\right] \\ & =-\log (0.0063) \\ & =-\log \left(6.3 \times 10^{-3}\right) \\ & =3-\log 6.3 \\ & =3-0.7993 \\ & =2.20\end{aligned}$

Asked in: MHT CET 2022 (08 Aug Shift 1)

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