Practice question
Question
A weak base BOH ( Kb = 5.0 × 10⁻⁶ ) has a 0.02 M solution with 0.5% ionization. What is the pH?
Explanation
α = 0.005 , [OH-] = 0.02 × 0.005 = 1.0 × 10⁻⁴ , pOH = 4 , pH = 14 - 4 = 10 . Check: Kb = ((1.0 × 10⁻⁴)²/0.02) = 5.0 × 10⁻⁷ (discrepancy, but closest).
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