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Sodium hexanitritocobaltate(III)

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]

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
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Synthesis and reactions

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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

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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.
  •  
    K2Na[Co(NO2)6]·H2O
 
Fragment of the Na3Co(NO2)6 lattice, highlighting the CoN6 and NaO6 coordination spheres.[6]

See also

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References

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  1. ^ "C&L Inventory". echa.europa.eu.
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  3. ^ Glemser, O. (1963). "Sodium Hexanitritocobaltate(III)". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. Vol. 1 (2nd ed.). New York, NY: Academic Press. p. 1541.
  4. ^ Vogel, A. I. (1951). Quantitative Inorganic Analysis (2nd ed.). Longmans Green and Co.
  5. ^ Bailey, E. H.; Stevens, R. E. (1960). "Selective staining of K-feldspar and plagioclase on rock slabs and thin sections". American Mineralogist. 45: 1020–1025. ISSN 1945-3027.
  6. ^ Brian N. Figgis; Alexandre N. Soboleva (2001). "Na3Co(NO2)6 at 293 and 10 K". Acta Crystallographica Section C. 57 (Pt 8): 885–886. doi:10.1107/S0108270101007995. PMID 11498599.
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