Adjective
polyprotic (comparative more polyprotic, superlative most polyprotic)
(chemistry, of an acid or a base) That can donate (or accept) more than one proton; polybasic.
Equivalence point is the theoretical completion of the reaction: the volume of added titrant at which the number of moles of titrant is equal to the number of moles of analyte, or some multiple thereof (as in polyprotic acids). Source: Internet
Calculation of the pH with a polyprotic acid requires a speciation calculation to be performed. Source: Internet
In practice, the ligand may be polyprotic; for example EDTA 4− can accept four protons; in that case, all pK a values must be known. 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