A diprotic acid is such a kind of polyprotic acids that has a tendency to release two protons from one mole of acid. This donation of H+ happens when the acid is present in an aqueous solution. Diprotic acid is also known as dibasic acid. On the other hand, the monoprotic acid is able to donate a single proton when is in the aqueous solution.
It is not the case that one mole of diprotic acid would donate both of its protons with the same ease. The donation of the first proton is easier as compared to the second one due to the fact that the dissociation constant of the first acid is larger.
Examples of Diprotic Acids
The acids like hydrochloric acid, oxalic acid, hydrogen sulfide, etc. all can donate two protons and hence are diprotic acids.
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