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name, formula, charge
ammonium
NH₄⁺; +1
hydroxide
OH⁻; -1
nitrate
NO₃⁻; -1
nitrite
NO₂⁻; -1
sulfate
SO₄²⁻; -2
sulfite
SO₃²⁻; -2
carbonate
CO₃²⁻; -2
phosphate
PO₄³⁻; -3
acetate
C₂H₃O₂⁻; -1