Kw (ion product of water): The equilibrium constant for the autoionization of water: Kw = [H⁺][OH⁻] = 1.0 × 10⁻¹⁴ at 25°C.
How to apply it: Use Kw to relate [H⁺] and [OH⁻] and to connect Ka and Kb: Ka × Kb = Kw.
Course: AP Chemistry · Unit: Acids and Bases
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