Sodium hexanitritocobaltate(III)

Chemical compound From Wikipedia, the free encyclopedia

Sodium hexanitritocobaltate(III) is an inorganic compound with the formula Na3[Co(NO2)6]. The anion of this yellow-coloured salt consists of the transition metal nitrite complex [Co(NO2)6]3−. It was a reagent for the qualitative test for potassium and ammonium ions.[2]

Quick facts Names, Identifiers ...
Sodium hexanitritocobaltate(III)
Names
IUPAC name
Sodium hexanitritocobaltate(III)
Other names
Sodium cobaltinitrite
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.692 Edit this at Wikidata
EC Number
  • 237-077-7
UNII
  • InChI=1S/Co.6NO2.3Na/c;6*2-1-3;;;/q-3;;;;;;;3*+1 checkY
    Key: IMBXIBFCGMYSME-UHFFFAOYSA-N checkY
  • 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*+1
    Key: IMBXIBFCGMYSME-PEVTYUNUAJ
  • [Na+].[Na+].[Na+].O=[N+]([O-])[Co-3]([N+]([O-])=O)([N+](=O)[O-])([N+]([O-])=O)([N+]([O-])=O)[N+]([O-])=O
Properties
Na3[Co(NO2)6]
Molar mass 403.933 g·mol−1
Appearance Yellow crystals
Density 2.565 g/cm3
Hazards
GHS labelling:[1]
GHS03: OxidizingGHS07: Exclamation markGHS08: Health hazard
Danger
H272, H315, H317, H319, H334, H335, H351
Safety data sheet (SDS) JT Baker MSDS
Related compounds
Other cations
 Potassium hexanitritocobaltate(III)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis and reactions

The compound is prepared by oxidation of cobalt(II) salts in the presence of sodium nitrite:[3]

4 [Co(H2O)6](NO3)2 + O2 + 24 NaNO2 → 4 Na3[Co(NO2)6] + 8 NaNO3 + 4 NaOH + 22 H2O

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, K2Na[Co(NO2)6]·H2O is precipitated and weighed.[4][page needed] In geochemical analysis, sodium cobaltinitrite is used to distinguish alkali feldspars from plagioclase feldspars in thin section.[5]

  • Concentrated aqueous solution of sodium cobaltinitrite.
    Concentrated aqueous solution of sodium cobaltinitrite.
  • K2Na[Co(NO2)6·H2O precipitate
    K2Na[Co(NO2)6]·H2O precipitate

References

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