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Sodium hexanitritocobaltate(III)

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Sodium hexanitritocobaltate(III)
Names
IUPAC name sodium hexanitritocobaltate(III)
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.692 Edit this at Wikidata
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Co.6NO2.3Na/c;6*2-1-3;;;/q-3;;;;;;;3*+1Key: IMBXIBFCGMYSME-UHFFFAOYSA-N
  • InChI=1/Co.6NO2.3Na/c;6*2-1-3;;;/q-3;;;;;;;3*+1/rCoN6O12.3Na/c8-2(9)1(3(10)11,4(12)13,5(14)15,6(16)17)7(18)19;;;/q-3;3*+1Key: IMBXIBFCGMYSME-PEVTYUNUAJ
SMILES
  • ...O=()(()=O)((=O))(()=O)(()=O)()=O
Properties
Chemical formula CoN6Na3O12
Molar mass 403.933 g·mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). ☒N verify (what is  ?) Infobox references
Chemical compound

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 as a qualitative 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. This compound is also frequently used in geology to distinguish alkali feldspars from plagioclase feldspars in thin section.

Sodium cobaltinitrite also forms the basis of a quantitative determination of potassium. However under the recommended reaction conditions the insoluble double salt, K2Na.H2O is precipitated and weighed. Also thallium(I) can be determined as the precipitate is Tl3.

See also

References

  1. G. Svelha, Vogels textbook of macro and semimicro qualitative inorganic analysis, (5th edition), Longman Group,ISBN 0-583-44367-9
  2. E.H. Bailey and R.E. Stevens,(1960), Selective staining of K-feldspar and plagioclase on rock slabs and thin sections, American Mineralogist vol. 45, pp. 1020-1025.
  3. ^ A.I. Vogel,(1951), Quantitative Inorganic analysis, (2d edition), Longmans Green and Co


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