Practice question
Question
The Ka of HCN is 4.9 × 10⁻¹⁰ . What is Kb of CN- at 298 K?
Explanation
Kw = Ka × Kb = 1.0 × 10⁻¹⁴ , so Kb = (Kw/Ka) = (1.0 × 10⁻¹⁴/4.9 × 10⁻¹⁰) ≈ 2.04 × 10⁻⁵ .
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