Posted by michelle on Thursday, June 10, 2010 at 12:33pm.
Write the ionization of H3PO4.
H3PO4 + H2O ==> H3O^+ + H2PO4^-
So H3PO4, phosphoric acid, lost a proton to form H2PO4^- so H2PO4^- is the conjugate base of H3PO4, the acid. H3PO4/H2PO4^- is the acid/conjugate base pair. H2O gained a proton to form H3O^+; therefore, H2O is the base and H3O^+ is its conjugate acid. The H2PO4^- ion is named dihydrogen phosphate ion.
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