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

a) 3.98 x 10^-10

Step-by-step 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.