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A polyprotic acid can (in a multi-step reaction) donate more than one proton per molecule of acid.

E.g. phosphoric acid can do 'the trick' three times:

  1. H3PO4 --> H+ + H2PO4-
  2. H2PO4- --> H+ + HPO42-
  3. HPO42- --> H+ + PO43-
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15y ago

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