The pH of a 0.0050 M aqueous solution of calcium hydroxide is
A) 11.40
B) 2.00
C) 12.00
D) 12.70
E) 11.70

Question

Quizplus · Accepted Answer

Calcium hydroxide is a strong base that dissociates completely in water according to the following equation:

Ca(OH)2 (s) → Ca2+ (aq) + 2OH- (aq)

The concentration of Ca(OH)2 in solution is 0.0050 M, which means that the concentration of OH- is twice that, or 0.01 M.

To calculate the pH, we first need to find the pOH:

pOH = -log[OH-] = -log(0.01) = 2

Then, we can find the pH using the equation:

pH + pOH = 14

pH = 14 - pOH = 14 - 2 = 12

Therefore, the pH of the solution is 12.00.

The PH of a 0