Question

The $pH$ of an aqueous solution is $6.$ The $[O{H}^{-}]$ of the solution will be

• A. $10^{-8}M$
• B. $10^{-6}M$
• C. $10^{-7}M$
• D. $10^{8}M$

Answer 1

Answer: (A)

$pH=-\log \left[H^{+}\right]=6$
$\left[H^{+}\right]=10^{-6},\left[O{H}^{-}\right]\left[H^{+}\right]=10^{-14}$
$\left[O{H}^{-}\right]=\frac{10^{-14}}{10^{-6}}=10^{-8}M.$