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Draw fully protonated phosphoric acid.

Draw fully protonated phosphoric acid.

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phophoric acid is a polyprotic acid that can release more than one H+ ions. Phosphoric acid contains three hydroxyl groups each which can release an H+ ion in aqueuos solution
protonation is the addition of a proton (H+) to an atom, molecule, or ion, forming the conjugate acid.

A phosphate ion can undergo proronarion as follows

PO43- + H+---------------------->HPO42-

HPO42- + H+----------------------->H2PO4-

H2PO4- + H+----------------------->H3PO4 (phosphoric acid)

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