Milk of magnesia is essentially a saturated solution of Mg(OH)₂ ( K _sp = 8.9×10^{- 12}). What is the pH of a saturated Mg(OH)₂ solution?

Question

Quizplus · Accepted Answer

The solubility product (Ksp) of Mg(OH)2 is used to calculate the concentration of OH- ions in solution. From Ksp = [Mg2+][OH-]^2, we find [OH-] = 2.82 x 10^-4 M. The pOH is -log[OH-] = 3.55, and pH = 14 - pOH = 10.45, which is closest to 10.42.

Milk of Magnesia Is Essentially a Saturated Solution of Mg(OH)2

Milk of Magnesia Is Essentially a Saturated Solution of Mg(OH)₂