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 pH of a solution is related to the concentration of hydrogen ions (H⁺) and hydroxide ions (OH⁻). The pH is given as 4.0, which means the concentration of H⁺ is 10⁻⁴ M. The product of the concentrations of H⁺ and OH⁻ is always 10⁻¹⁴ at 25°C (Kw = [H⁺][OH⁻] = 10⁻¹⁴). Therefore, [OH⁻] = 10⁻¹⁴ / 10⁻⁴ = 10⁻¹⁰ M.

Measurements Show That the PH of a Particular Lake Is