Use the following information to answer the questions below.
You live in Atlantic Canada and you are Skyping a friend in Manitoba. You are both complaining about the weather as both regions are being subjected to the same arctic air mass. As you discuss it, however, it becomes clear that she is experiencing a bitter cold that you are not. You realize that you had pretty much the same conversation last summer when it was much hotter in Manitoba than at home.
-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 the lake is 4.0, which means the concentration of hydrogen ions [H⁺] is 10⁻⁴ M. The product of [H⁺] and [OH⁻] in water is always 10⁻¹⁴ M². Therefore, [OH⁻] = 10⁻¹⁴ M² / 10⁻⁴ M = 10⁻¹⁰ M.

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