Base (chemistry)
Monoprotic and polyprotic bases

Bases with only one ionizable hydroxide (OH) ion per formula unit are called monoprotic since they can accept one proton (H). Bases with more than one OH- per formula unit are polyprotic.

The number of ionizable hydroxide (OH) ions present in one formula unit of a base is also called the acidity of the base. On the basis of acidity bases can be classified into three types: monoacidic, diacidic and triacidic.
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