A Solution Contains 0

Multiple Choice

A solution contains 0.10 M Ca²⁺ and 0.10 M Mg²⁺.The pH of the solution is raised without changing the volume of the solution.What percentage of Mg²⁺ remains in solution when Ca(OH) ₂(s) first begins to precipitate? (K_sp of Ca(OH) ₂ = 4.0 × 10−⁶ and K_sp of Mg(OH) ₂ = 7.1 × 10−¹²)

A) 1.8 × 10−⁴ %
B) 4.0 × 10−⁴ %
C) 6.3 × 10−³ %
D) 7.2 × 10−³ %
E) 1.4 × 10−² %