$\mathrm{K}_{\mathrm{a}}$ for butyric acid $\left(\mathrm{C}_3 \mathrm{H}_7 \mathrm{COOH}\right)$ is $2 \times 10^{-5}$. The pH of 0.2 M solution of butyric acid is $\_\_\_\_$ $\times 10^{-1}$.
(Nearest integer) [Given $\log 2=0.30]$
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