16.8 Relationship Between Ka and Kb

• Ka and Kb for a conjugate acid-base pair are related by Kw

• Ka Kb = Kw

• NH3(aq) + H2O(l) ? NH4+(aq) + OH-(aq)

• Kb = [NH4+][OH-]/[NH3]

• NH4+(aq) + H2O(l) ? NH3(aq) + H3O+(aq)

• Ka = [NH3][H3O+]/[NH4+]

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