diprotic


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di·prot·ic

 (dī-prŏt′ĭk)
adj.
Having two hydrogen ions to donate to bases in an acid-base reaction.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Grape juice has two diprotic acids: the stronger tartaric acid (symbolized as H, Ta) with pKas of 3.0 and 4.2, and the weaker malic acid (H, Ma) with pKas of 3.5 and 5.0.