Rules for Naming Ions Negative ions--Anions 4.Anions derived by adding a H+to an oxyanion are named by adding hydrogen or dihydrogen CO:carbonate ion Bicarbonate ion HCO:hydrogen carbonate ion SO:sulfate ion Bisulfate ion HSO:hydrogen sulfate ion MnO:manganate ion PO phosphate ion MnO:permanganate ion HPO:hydrogen phosphate ion CrO:chromate ion H,PO:dihydrogen phosphate ion CrOdichromate ion4. Anions derived by adding a H+ to an oxyanion are named by adding hydrogen or dihydrogen 2 4 4 : : S ate hydrogen O sulf ion HSO sulfate ion   2 3 3 : : C ate hydrogen O carbon ion HCO carbonate ion   Bisulfate ion Bicarbonate ion 3 4 2 4 2 4 : : : ate hy PO phosph ion HPO phosph ion H PO drogen ate dihydrogen phosphate ion    2 4 2 2 7 : : CrO chrom ion Cr O chrom ate di ate ion   2 4 4 : : MnO mangan ion MnO mangan ate per ate ion  