The Kb of NH₃ is 1.8 × 10⁻⁵ . What is the Ka of NH₄+ ?
Kw = Ka × Kb = 1.0 × 10⁻¹⁴ , Ka = (Kw/Kb) = (1.0 × 10⁻¹⁴/1.8 × 10⁻⁵) ≈ 5.56 × 10⁻¹⁰ .
Ref: NCERT Class 11 Chemistry > Chapter 6: Equilibrium > Topic: Relationship Between Kp Kc and Factors Affecting Equilibrium - Le Chatelier