Q. The pH value of 0.1 M NaOH solution is (when there is a given reaction $[H^+ ][OH^- ] = 10^{-14})$

Solution:

[H+] [OH -] = 10-14
Concentration of OH - i.e. [OH- ] in 0.1 M NaOH solution, [OH - ] = 10-1 M
$\Rightarrow \left[H^{+}\right]=\dfrac{10^{-14}}{10^{-1}}=10^{-13}$
$\Rightarrow pH=-log\left[H^{+}\right]=13$

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