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

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

AIIMSAIIMS 2000Equilibrium

Solution:

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