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ksp Mg(OH)₂ = 2x10⁻¹¹
MgCl₂ -------> Mg²⁺ + 2Cl⁻
2x10⁻³ 2x10⁻³ 4x10⁻³
Mg(OH)₂ <-----> Mg²⁺ + 2OH⁻
Ksp = [Mg²⁺] [OH⁻]²
2x10⁻¹¹ = 2x10⁻³ [OH⁻]²
[OH⁻]² =
[OH⁻] =
[OH⁻] = 10⁻⁴
pOH = -log[OH⁻]
pOH = -log[1x10⁻⁴]
pOH = 4
pH = 14 - pOH
pH = 14 - 4
pH = 4