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Having two hydrogen ions to donate to bases in an acid-base reaction.

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The titration of an acid with a base provides a textbook example in analytical chemistry of the variation of pH during a chemical reaction; for this purpose the calculation of a curve for the titration of a monoprotic acid with a monoprotic base might be practicable as a tedious manual calculation, whereas an analogous calculation for a diprotic acid might strain the limit of human patience, even when approximations, possibly severe, are invoked.
Grape juice has two diprotic acids: the stronger tartaric acid (symbolized as H, Ta) with pKas of 3.
Guven, Prediction of swelling behaviour of hydrogels containing diprotic acid moieties, Polymer, 39(5), 1165-1172 (1998).