Question

The concentration of $O{H}^{-}$ ions in a solution with the $H^{+}$ ions concentration of $1.3\times {10}^{-4}$M is?

• A. $7.7\times {10}^{-4}$
• B. $1.3\times {10}^{-4}$M
• C. $2.6\times {10}^{-8}$M
• D. $7.7\times {10}^{-11}$M

Answer 1

The correct option is D $7.7\times {10}^{-11}$M

Product of hydrogen ion concentration and hydroxide ion concentration is equal to 1.0 x 10${}^{-14}$.

${[OH}^{-}]\times [H^{+}]=1\times {10}^{-14}$.

${[OH}^{-}]$ = $\frac{{10}^{-14}}{1.3\times {10}^{-4}}=7.7\times {10}^{-11}$.

Thus, the correct answer is option D.