A 1.0 × 10^-2 M aqueous solution of Ca(OH)₂ at 25.0 °C has a pH of ________.

Question

Quizplus · Accepted Answer

Ca(OH)2 is a strong base and completely dissociates in water to form Ca2+ and OH- ions. The concentration of OH- ions is twice the concentration of Ca2+ ions. Using the formula pH = 14 - pOH, we can calculate the pOH of the solution: pOH = -log[OH-] = -log(2.0 × 10^-2) = 1.70. Therefore, the pH of the solution is 14 - 1.70 = 12.30. Choice A is the correct answer.

A 10 × 10-2 M Aqueous Solution of Ca(OH)2 at 25

A 10 × 10^-2 M Aqueous Solution of Ca(OH)₂ at 25