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ion PO₄^3- is derived from phosphoric acid by the removal of three protons . Removal of one proton gives the dihydrogen phosphate ion H₂PO₄^- while removal of two protons gives the hydrogen phosphate ion HPO₄^2-. These names are also used in chemistry for salts of those anions, such as ammonium dihydrogen phosphate and trisodium phosphate.

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