Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 × 10^-² M in hydronium ion. A) 2.86 × 10^-⁵ M B) 2.86 × 10^-¹⁰ M C) 2.86 × 10^-¹³ M D) 3.50 × 10^-¹³ M

Question

Quizplus · Accepted Answer

Using the Kw expression: 
Kw = [H+][OH-] = 1.0 × 10^-14 at 25°C 
Rearranging to solve for [OH-]: 
[OH-] = Kw/[H+] = 1.0 × 10^-14/3.50 × 10^-11 
[OH-] = 2.86 × 10^-4 M 
Therefore, the answer is C.

Calculate the Hydroxide Ion Concentration in an Aqueous Solution That