Calculateur de pKa — Formule

How to Calculate pKa

Formula

pKa = −log₁₀(Ka)

Where:

  • pKa = negative base-10 logarithm of Ka
  • Ka = acid dissociation constant

    • A lower pKa indicates a stronger acid. pKa is more convenient than Ka for comparing acid strengths.

    Exemple Résolu

    Acetic acid has Ka = 1.75 × 10⁻⁵.

    1. pKa = -log₁₀(Ka)
    2. pKa = -log₁₀(1.75 × 10⁻⁵)
    3. pKa = 4.76