Adjective
diprotic (not comparable)
(chemistry, of an acid or base) Tending to donate or accept two hydrogen ions (H) in solution.
A diprotic acid (here symbolized by H 2 A) can undergo one or two dissociations depending on the pH. Source: Internet
The five-membered ring also possesses a keto group (in the 8 position), flanked by two secondary amino groups (in the 7 and 9 positions), and deprotonation of one of these at high pH could explain the pK 2 and behavior as a diprotic acid. Source: Internet
Specific types of polyprotic acids have more specific names, such as diprotic acid (two potential protons to donate) and triprotic acid (three potential protons to donate). Source: Internet
Washington, DC: The National Academies Press, 2010. 1. Print. Acidity of carbonic acid Carbonic acid is one of the polyprotic acids : It is diprotic - it has two protons, which may dissociate from the parent molecule. Source: Internet