Sodium cobaltinitrite
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Sodium cobaltinitrite is a coordination compound with the formula Na3Co(NO2)6. The anion of this yellow-coloured salt consists of a cobalt(III) center bound to six nitrito ligands. It is used to test for potassium and ammonium ions (provided that certain other cations are absent). Although the sodium salt is soluble in water, those of potassium and ammonium are insoluble. The potassium and ammonium salts are precipitated as yellow solids. According to IUPAC nomenclature, it is called sodium Hexanitritocobaltate(III).