Is H3PO4 a triprotic or diprotic acid, if it is a trprotic acid, then how do we explain its reaction with sodium hydroxide? i.e. H3PO4 + 2NaOH == Na2HPO4 + 2H2O.

Md Ariful Islam

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H3PO4 is a trprotic acid,but the reactivity of cleavage ща proton determine the dissociation constant. For the third proton is much smaller than for the second and first H3PO4(s) + H2O(l) https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png H3O+(aq) + H2PO4minus;(aq) Ka1 = 7.25times;10minus;3 H2PO4minus;(aq) + H2O(l) https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png H3O+(aq) + HPO42minus;(aq) Ka2 = 6.31times;10minus;8 HPO42minus;(aq) + H2O(l) https://upload.wikimedia.org/wikipedia/commons/thumb/9/96/Equilibrium.svg/15px-Equilibrium.svg.png H3O+(aq) + PO43minus;(aq) Ka3 = 3.98times;10minus;13
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