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Sodium hexanitritocobaltate(III)

Sodium hexanitritocobaltate(III) is an inorganic compound with the formula . The anion of this yellow-coloured salt consists of the transition metal nitrite complex . It was a reagent for the qualitative test for potassium and ammonium ions.

Synthesis and reactions

The compound is prepared by oxidation of cobalt(II) salts in the presence of sodium nitrite: :

Application for analysis of potassium

Although the sodium cobaltinitrite is soluble in water, it forms the basis of a quantitative determination of potassium, thallium, and ammonium ions. Under the recommended reaction conditions the insoluble double salt, is precipitated and weighed. In geochemical analysis, sodium cobaltinitrite is used to distinguish alkali feldspars from plagioclase feldspars in thin section. |File:Sodium hexanitritocobaltate(III) solution.jpg |Concentrated aqueous solution of sodium cobaltinitrite. |File:Impure dipotassium sodium cobaltinitrite (K2Na(Co(NO2)6)) monohydrate.jpg | precipitate |File:EntryWithCollCode280729.png |Fragment of the lattice of Na3Co(NO2)6, highlighting the and coordination spheres. Color code: blue = N, black-blue = Co, red = O.

References

References

  1. "C&L Inventory".
  2. {{Greenwood&Earnshaw2nd
  3. Glemser, O.. (1963). "Sodium Hexanitritocobaltate(III)". Academic Press.
  4. Vogel, A. I.. (1951). "Quantitative Inorganic Analysis". Longmans Green and Co..
  5. Bailey, E. H.. (1960). "Selective staining of K-feldspar and plagioclase on rock slabs and thin sections". American Mineralogist.
  6. Brian N. Figgis. (2001). "Na3Co(NO2)6 at 293 and 10 K". Acta Crystallographica Section C.
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cobalt-complexes sodium-compounds chemical-tests inorganic-compounds coordination-complexes nitrites
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