Measurements show that the pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?

Question

Quizplus · Accepted Answer

The hydroxide ion concentration ([OH⁻]) in a solution can be found using the relationship between the hydrogen ion concentration ([H⁺]), the hydroxide ion concentration ([OH⁻]), and the ion product of water (Kw), where Kw = [H⁺][OH⁻] = 1.0 x 10⁻¹⁴ at 25°C. Given the pH is 4.0, [H⁺] = 10⁻⁴ M. Therefore, [OH⁻] = Kw / [H⁺] = (1.0 x 10⁻¹⁴) / (10⁻⁴) = 10⁻¹⁰ M.

Measurements Show That the PH of a Particular Lake Is