What is the hydroxide ion concentration and the pH for a hydrochloric acid solution that has a hydronium ion concentration of 1.50 × 10^-4 M? A)6.67 × 10^-10 M,4.82 B)6.67 × 10^-10 M,9.18 C)6.67 × 10^-11 M,3.82 D)6.67 × 10^-11 M,10.18

Question

Quizplus · Accepted Answer

The ion product constant for water, Kw = [H+][OH-] at 25°C is 1.0 x 10^-14. 
So, [OH-] = Kw / [H3O+] = 1.0 x 10^-14 / 1.50 × 10^-4 = 6.67 × 10^-11 M 
pH = -log[H+] = -log(1.50 × 10^-4) ≈ 3.82. 
Therefore, the correct option is (C) 6.67 × 10^-11 M, 3.82.

What Is the Hydroxide Ion Concentration and the PH for a Hydrochloric