Question

What is the pH of a solution with a hydronium (H3O+) concentration of 5.6 × 10-9 M? Use the table to help you.

A. 7.00
B. 8.25
C. 9.00
D. 9.76

Answer 1

The pH is defined as the hydrogen ion concetration in a solution. Since we are given the concentration of
`H_3O^(+)`, which is the same as
`H^(+)`, we use the formula
`pH= -log [H^(+) ]` to find the pH of the solution.

`pH= -log[H^(+)] = -log [5.6 * 10^(-9) ] = 8.25`

The correct answer is B.

Answer 2

Answer: Option (B) is the correct answer.

Step-by-step explanation:

pH is defined as the measurement of hydrogen or hydroxide ions in a solution.

Mathematically, pH =
`-log[H^(+)]`

It is given that concentration of
`[H^(+)]` or hydronium ion
`[H_(3)O^(+)]` is
`5.6 * 10^(-9)`.

Therefore, calculate the pH as follows.

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

=
`-log[5.6 * 10^(-9)]`

= 8.25

Thus, we can conclude pH of the solution is 8.25.