If the solubility of Mg²⁺ ions in seawater is 1350 mg/L, what pH is needed to precipitate Mg(OH)₂? Ksp (Mg(OH)₂ = 5.61 x 10(⁻¹²)
A) pH > 12
B) pH < 7
C) pH = 7
D) pH between 7 and 12