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Mar 25, 2011 · The conjugate acid of HPO42- is H2PO4-. HPO42- + H+ ----> H2PO4- PO43- is a weak conjugate base (since it is not the conjugate base of a strong acid, which has no strenth) has a charge of minus three, which means it can hold 3 H+'s. Jul 14, 2010 · An acid is an H+ donor, and conjugate acids come from bases (here, HPO4^2-). Your base will have one fewer H+ ion than its conjugate acid. Therefore, H2PO4^- is your conjugate acid. Favorite Answer Add a proton to the compound and you'll get its conjugate base. Therefore, the conjugate is H2PO4-, aka dihydrogen phosphate ion.