With respect to acidity, how does #H_3PO_4# behave in aqueous solution?

Answer 1

Well, phosphoric acid is a fairly WEAK acid.......but in aqueous solution it is a diacid.........

#H_3PO_4(aq) + H_2O(l) rightleftharpoons H_2PO_4^(-) + H_3O^+#

#H_2PO_4^(2-)# does undergo some dissociation in aqueous solution.......

#H_2PO_4^(-)(aq) + H_2O(l) rightleftharpoons HPO_4^(2-) + H_3O^+#

The third dissociation is largely irrelevant and non-operative in aqueous solution........You will have to look up #pK_(a1)#, #pK_(a2)# yisself.

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Answer 2

Serenity Allen

H3PO4 behaves as a weak acid in aqueous solution, partially dissociating to release H+ ions. It can donate up to three protons (H+ ions) in sequential dissociation steps, forming H2PO4-, HPO4^2-, and PO4^3- ions successively.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.