Practice question
Question
The Ksp of Fe(OH)2 is 4.9 × 10⁻¹⁷ . What is the pH at which [Fe²⁺] = 1.0 × 10⁻⁶ M in a saturated solution?
Explanation
For Fe(OH)2 <=> Fe²⁺ + 2OH- , Ksp = [Fe²⁺][OH-]² = 4.9 × 10⁻¹⁷ , (1.0 × 10⁻⁶)[OH-]² = 4.9 × 10⁻¹⁷ , [OH-]² = 4.9 × 10⁻¹¹ , [OH-] = 7.0 × 10⁻⁶ , pOH = 5.15 , pH = 14 - 5.15 = 8.85 .
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