Consider a salt of a weak base and a weak acid such as ammonium cyanide. Both the NH4+ and CN− ions interact with water in aqueous solution, but the net reaction can be considered as a proton transfer from NH4+ to CN−.
NH4+(aq) + CN−(aq) ⇌ NH3(aq) + HCN(aq)
where Ka is the ionization constant for the weak acid NH4+ and Kb, is the constant for the weak base CN−.
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