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ammonium
NH₄⁺
mercury(I)
Hg₂²⁺
sulfite
SO₃²⁻
sulfate
SO₄²⁻
hydrogen phosphate
HPO₄²⁻
phosphate
PO₄³⁻
carbonate
CO₃²⁻
dichromate
Cr₂O₇²⁻
chromate
CrO₄²⁻
peroxide
O₂²⁻
oxalate
C₂O₄²⁻
thiosulfate
S₂O₃²⁻