Question

The hydroxyl ion concentration in a solution having $pH$ value $3$ will be

• A. $10^{-11}$
• B. $10^{-7}$
• C. $10^{-3}$
• D. $10^{-14}$

Answer 1

Answer: (A)

Hydrogen ion concentration of solution having $pH$ value $3=10^{-3}$
Now, $[O{H}^{-}][H^{+}]=10^{-14}$
$\Rightarrow [O{H}^{-}]=\frac{10^{-14}}{[H^{+}]}$
$=\frac{10^{-14}}{10^{-3}}$
$=10^{-11}$