Ka × Kb = Kw for conjugate pair (Ka(HA) × Kb(A-) = Kw)

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Ka(HA) × Kb(A-) = Kw

What each symbol means

SymbolWhat it stands for
HAAcid and A- its conjugate base in water
K_wIonic product of water at that temperature

When to use this

Conjugate acid–base pair in aqueous chemistry; same temperature for all K.