Practice question

MCQ

Question

The Ka of HNO₂ is 4.5 × 10⁻⁴ . What is the Kb of NO₂- at 298 K?

Options

Choose one · Correct answer highlighted

4.5 × 10⁻⁴ 1.0 × 10⁻¹⁴ 5.0 × 10⁻¹⁰ 2.22 × 10⁻¹¹ Correct

Explanation

Kw = Ka × Kb = 1.0 × 10⁻¹⁴ , Kb = (1.0 × 10⁻¹⁴/4.5 × 10⁻⁴) ≈ 2.22 × 10⁻¹¹ .

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