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Fe(OH)₂ --> Fe²⁺ + 2 OH⁻
Ksp = s . (2s)²
8 . 10⁻¹⁶ = 4s³
s³ = 2 . 10⁻¹⁶
s = ∛2.10⁻¹⁶
b.)
NaOH, OH⁻ = 10⁻²
Fe(OH)₂ --> Fe²⁺ + 2 OH⁻
Ksp = s . (10⁻²)²
8 . 10⁻¹⁶ = 10⁻⁴s
s = 8 . 10⁻¹²
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