The dihydrogenphosphate ion, H2PO4 - is amphiprotic. In which of the following reactions is this ion serving as a base?
H3O + (aq) + H2PO4 - (aq) ⇌ H3PO4 (aq) + H2O (l)
H3O + (aq) + HPO42 - (aq) ⇌ H2PO4 - (aq) + H2O (l)
H3PO4 (aq) + HPO42 - (aq) ⇌ 2 H2PO4 - (aq)
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