Question

What is the [H+] of a solution with a pH of 9.40?
a) 3.98 x 10^-10
b) 3.98 x 10^-8
c) 3.98 x 10^-6
d) 3.98 x 10^-4

Answer 1

Answer:

a) 3.98 x 10^-10

Explanation:

Hello,

In this case, for the given pH, we can compute the concentration of hydronium by using the following formula:

$pH=-log([H^+])$

Hence, solving for the concentration of hydronium:

$[H^+]=10^{-pH}=10^{-9.40}$

$[H^+]=3.98x10^{-10}M$

Therefore, answer is a) 3.98 x 10^-10

Best regards.