The concentration of hydroxide ions in a saturated solution of Ca(OH)₂ is 4.18 x 10^-3 mol dm^-3. What is the pH of this solution?

Question

Quizplus · Accepted Answer

The pH of a solution is calculated using the formula pH = -log[H+]. In this case, we have the concentration of hydroxide ions, so we need to first calculate the concentration of hydrogen ions using the dissociation constant for water: Kw = [H+][OH-] = 1.0 x 10^-14. Rearranging this equation, we get [H+] = Kw/[OH-]. Substituting the given value of [OH-] into this equation, we get [H+] = 1.0 x 10^-14/4.18 x 10^-3 = 2.39 x 10^-12 mol dm^-3. Now we can calculate the pH: pH = -log[H+] = -log(2.39 x 10^-12) = 11.6.

The Concentration of Hydroxide Ions in a Saturated Solution of Ca(OH)2

The Concentration of Hydroxide Ions in a Saturated Solution of Ca(OH)₂