What is the hydronium ion concentration of a solution of a solution with a pOH of 8.3

1.28 x 10^-6

1.99 x 10 ^-6

2.34 x 10^-5

2.86 x 19^-5

The hydronium ion concentration is 1.99 * 10^-6 M

Explanation:

Step 1: pOH = 8.3

pOH + pH = 14

Step 2: Calculate [H3O+] = [H+]

pOH + pH = 14

pH = 14 - pOH

pH = 14 - 8.3 = 5.7

pH = - log[H+] = 5.7

[H+] 10^ (-0.57) = 1.995 * 10^-6

[H+] = [H3O+] = 1.995 * 10^-6 M

The hydronium ion concentration is 1.99 * 10^-6 M