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Fe(OH)₃ ---> Fe²⁺ + 3 OH⁻
s s 3s
Ksp Fe(OH)₃ = (s).(3s)³
1,6 x 10⁻¹⁴ = s . 27s³
1,6 x 10⁻¹⁴ = 27s⁴
s = ∛0,06 x 10⁻¹⁴
s = 7,34 x 10⁻⁵