Question

The pH value of $0.1MNaOH$ solution is (when there is a given reaction $\left[H^{+}\right]\left[O{H}^{-}\right]=10^{-14})$

• A. 13
• B. 12
• C. 11
• D. 2

Answer 1

Answer: (A)

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