Question

Calculate the [H3O'J in a solution that has a pH of 9.11. A) 7.8 x 10-10 B) 1.3 x 10-5 C) 9.1 x 10-9 D) 0.96 E) 0.69

Answer 1

Answer: The correct answer is Option A.

Explanation:

pH is defined as negative logarithm of hydronium ion concentration. It is basically defined as the power of hydrogen ions that are present in a solution.

Mathematically,

$pH=-\log[H_3O^+]$

pH of the solution = 9.11

Putting values in above equation, we get:

$9.11=-\log[H_3O^+]$

$[H_3O^+]=antilog(-9.11)$

$[H_3O^+]=7.8\times 10^{-10}$

Hence, the correct answer is Option A.