Question

pH value of a solution, whose hydronium ion concentration is $6.2\times {10}^{-9}$

mol/l, is

• A. 6.21
• B. 7.21
• C. 7.75
• D. 8.21

Answer 1

The correct option is D

8.21

$\left[H_3{O}^{+}\right]$ means $\left[H^{+}\right]=6.2\times {10}^{-9}mol/l$
$pH=-log(6.2\times {10}^{-9}$) = $8.21$