Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 × 10^-⁴ mol L^-1 in hydronium ion. A)2.86 × 10^-³ mol L^-1 B)2.86 × 10^-¹⁰ mol L^-1 C)2.86 × 10^-¹¹ mol L^-1 D)3.50 × 10^-¹¹ mol L^-1

Question

Quizplus · Accepted Answer

The concentration of hydroxide ion can be calculated using the equation Kw = [H+][OH-], where Kw is the ion product constant, which is equal to 1.0 × 10^-14 at 25°C.

First, we need to find the concentration of hydronium ion, which is equal to 3.50 × 10^-11 mol/L.

Substituting this value into the equation Kw = [H+][OH-], we get:

1.0 × 10^-14 = (3.50 × 10^-11)[OH-]

Rearranging the equation gives:

[OH-] = (1.0 × 10^-14) ÷ (3.50 × 10^-11) = 2.86 × 10^-4 mol/L

Therefore, the hydroxide ion concentration is 2.86 × 10^-4 mol/L. The correct answer choice is C.

Calculate the Hydroxide Ion Concentration in an Aqueous Solution That