Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxyl ion concentration of this lake?

Question

Quizplus · Accepted Answer

If the pH of a solution is 4.0, that means the concentration of hydrogen ions (H+) is 1 × 10⁻⁴ M. Using the equation for the ion product of water (Kw = [H+][OH-]), we can solve for the hydroxyl ion (OH-) concentration: 
Kw = [H+][OH-] 
1 × 10⁻¹⁴ = (1 × 10⁻⁴)[OH-] 
[OH-] = 1 × 10⁻¹⁰ M. Therefore, the hydroxyl ion concentration of the lake water is 1 × 10⁻¹⁰ mol/L.

Assume That Acid Rain Has Lowered the PH of a Particular