Answer
$(HPO_4)^{2-}$ -> $H^+ + (PO^4)^{3-}$
$(HPO_4)^{2-}+H^+$ -> $(H_2PO^4)^{-}$
Work Step by Step
$(HPO_4)^{2-}$ -> $H^+ + (PO^4)^{3-}$
$(HPO_4)^{2-}+H^+$ -> $(H_2PO^4)^{-}$
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