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Chemistry Question on Acids and Bases

The pH value of 0.1 M NaOH0.1\, M\, NaOH solution is (when there is a given reaction [H+][OH−]=10−14)\left.\left[ H ^{+}\right]\left[ OH ^{-}\right]=10^{-14}\right)

A

13

B

12

C

11

D

2

Answer

13

Explanation

Solution

[H] [OH ] = 10 Concentration of OH - i.e. [OH ] in 0.1 M NaOH solution, [OH - ] = 10 M ⇒[H+]=10−1410−1=10−13\Rightarrow \left[H^{+}\right]=\frac{10^{-14}}{10^{-1}}=10^{-13} ⇒pH=−log[H+]=13\Rightarrow pH=-log\left[H^{+}\right]=13