What is the pH of a saturated solution... Please help me! I'm stuck!

Question

Ksp of magnesium hydroxide is 1.20 x 10 -11. What is the pH of a saturated solution of magnesium hydroxide at equilibrium?

Answer 1

When placed in water, we have this equation

Mg(OH)2(s) <--> Mg^2+(aq) + 2OH-(aq)

Ksp = [Mg^2+][OH-]² = 1.20E-11

1.20E-11 = (x)(2x)² = 4x&#179

x = 1.44224957E-4

Since [OH-] = 2x, then [OH-] = 2.884499141E-11M

pOH = -log(OH-) = 3.540



pH + pOH = 14, so pH = 10.460

[Answer: see above]