Kb Rechner — Formel

How to Calculate Kb

Formula

Kb = [BH⁺][OH⁻] / [B]

Where:

  • Kb = base dissociation constant
  • [BH⁺] = concentration of conjugate acid at equilibrium
  • [OH⁻] = hydroxide ion concentration at equilibrium
  • [B] = concentration of undissociated base at equilibrium

    • Larger Kb indicates a stronger base.

    Lösungsbeispiel

    A 0.1 M ammonia solution has [NH4⁺] = 0.01 M and [OH⁻] = 0.01 M at equilibrium.

    1. Kb = [BH⁺][OH⁻] / [B]
    2. Kb = (0.01)(0.01) / 0.1
    3. Kb = 0.0001 / 0.1
    4. Kb = 1.0 × 10⁻³