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charges of common polyatomic ions

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ammonium
NH sub 1, 1+
acetate
C sub 2 H sub 3 O sub 2, 1-
cyanide
CN 1-
hydroxide
OH 1-
nitrate
NO sub 3, 1-
bicarbonate (hydrogen carbonate)
HCO sub 3, 1-
carbonate
CO sub 3, 2-
sulfate
SO sub 4, 2-
phosphate
PO sub 4, 3-