triprotic


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tri·prot·ic

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

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References in periodicals archive ?
It is well known that phosphoric acid is a triprotic acid with three ionisable hydrogen atoms.
Phosphoric acid is triprotic but the third dissociation is well beyond the range of soil pH.