Calculate the hydroxide ion concentration in an aqueous potassium hydroxide solution that contains 3.50 × 10^-6 M in hydronium ion. A) 2.86 × 10^-¹ M B) 2.86 × 10^-8 M C) 2.86 × 10^-9 M D) 3.50 × 10^-9 M E) 3.50 × 10^-6 M

Question

Quizplus · Accepted Answer

This is a basic solution, so we can use the equation Kw = [H+][OH-] and solve for [OH-]. Kw is the ion product constant for water, which at room temperature is 1.0 × 10^-14.

Kw = [H+][OH-]

1.0 × 10^-14 = (3.50 × 10^-6)([OH-])

[OH-] = 2.86 × 10^-9

Therefore, the hydroxide ion concentration in the solution is 2.86 × 10^-9 M. The correct answer choice is C.

Calculate the Hydroxide Ion Concentration in an Aqueous Potassium Hydroxide