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Ksp = [Fe³⁺] [OH⁻]³
10⁻³⁸ = [0,00001] [OH⁻]³
10⁻³⁸ = [10⁻⁵] [OH⁻]³
10⁻³³ = [OH⁻]³
[OH⁻] = ∛10⁻³³
[OH⁻] = 10⁻¹¹
pOH = -log [OH⁻]
pOH = -log [10⁻¹¹]
pOH = 11
pH = 14 - pOH
pH = 14 - 11
pH = 3
Jadi, endapan Fe(OH)₃ mulai terbentuk pada pH 3