What are the concentrations of hydroxide and hydronium ions in a solution with a pH of 8.3?

2.9 * 10-5 M H3O + and 3.4 * 10-10 M OH-

3.1 * 10-6 M H3O + and 3.2 * 10-9 M OH-

5.0 * 10-9 M H3O + and 2.0 * 10-6 M OH-

6.3 * 10-11 M H3O + and 1.6 * 10-4 M OH-

The hydroxide concentration is 2*10^-6 M

The hydronium concentration is 5*10^-9 M

Explanation:

Step 1: Data given

pH = 8.3

Step 2: Calculate [H+]

pH = 8.3 = - log [H+]

[H+] = 10^-8.3 = 5*10^-9 M

[H+] = [H3O+] = 5*10^-9 M

Step 3: Calculate pOH

pH + pOH = 14

pOH = 14 - pH = 14 - 8.3 = 5.7

Step 4: Calculate concentration of hydroxide

pOH = - log [OH-] = 5.7

[OH-] = 10^-5.7 = 2*10^-6 M

The hydroxide concentration is 2*10^-6 M

The hydronium concentration is 5*10^-9 M