Ammonia is a gas whose smell we detect in manure as well as in some cleaning solutions, among other things. If the concentration of this noxious gas can be controlled by regulating the pH of the water because only the non-protonated form is volatile.
The pKa for the preceding reaction is 9.3. Explain what fraction of the total nitrogen (NH4+ + NH3) is in the volatile form at pH 9.0?