Equilibrium constant for the dissociation HA + H₂O ⇌ A⁻ + H₃O⁺. Kₐ = [A⁻][H₃O⁺] / [HA]; pKₐ = −log₁₀ Kₐ. Large Kₐ (small pKₐ) = strong acid. pKₐ is the gold-standard descriptor of acid strength: HCl (−7), H₂SO₄ (−3, first), acetic acid…
Equilibrium constant for the dissociation HA + H₂O ⇌ A⁻ + H₃O⁺. Kₐ = [A⁻][H₃O⁺] / [HA]; pKₐ = −log₁₀ Kₐ. Large Kₐ (small pKₐ) = strong acid. pKₐ is the gold-standard descriptor of acid strength: HCl (−7), H₂SO₄ (−3, first), acetic acid…