Question

Find the hydroxide concentration for a solution with a pH of 10 at 25${}^o$C.

• A. 10${}^{-14}$ M
• B. 10${}^{-10}$ M
• C. 10${}^{-4}$ M
• D. 10${}^{-1}$ M

Answer 1

The correct option is C 10${}^{-4}$ M

$pH=10$

$pOH=14-pH=14-10=4$

$\left[O{H}^{-}\right]={10}^{-pOH}={10}^{-4}M$

Hence, the hydroxide concentration for a solution is ${10}^{-4}M$

Hence, the correct option is $\text{C}$