Question

What is the concentration of hydronium ions in a solution with a pH = 3.9?

4.14 × 10-2
7.80 × 10-3
1.26 × 10-4
3.00 × 10-5
@nechirwan

Answer 1

\[[H3O+]=10^{-pH}\]
= \[10^{-3,9}\]
= 1.26 × 10-4