Question

What is the hydrogen ion concentration of a solution with a pH of 4.2?

a) 3.2 x 10-6 M
b) 2.7 x 10-9M
c) 6.4 x 10-5 M
d) 1.0 x 10-6 M.

Answer 1

Explanation:

pH = 4.2

- log[H+] = 4.2

`[ H+] = {10}^( - 4.2)`

`[ H+] = 6.4 * {10}^( - 5)`

OPTION C