Sodium hexanitritocobaltate(III)

Sodium hexanitritocobaltate(III)
Names
	IUPAC name Sodium hexanitritocobaltate(III)
	Other names Sodium cobaltinitrite
Identifiers
CAS Number	13600-98-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	13198283 ;
ECHA InfoCard	100.033.692
EC Number	237-077-7;
PubChem CID	16211641;
UNII	XO0NGY9EY7 ;
CompTox Dashboard (EPA)	DTXSID00894906 ;
	InChI InChI=1S/Co.6NO2.3Na/c;62-1-3;;;/q-3;;;;;;;3+1 Key: IMBXIBFCGMYSME-UHFFFAOYSA-N ; InChI=1/Co.6NO2.3Na/c;62-1-3;;;/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;
	SMILES [Na+].[Na+].[Na+].O=[N+]([O-])[Co-3]([N+]([O-])=O)([N+](=O)[O-])([N+]([O-])=O)([N+]([O-])=O)[N+]([O-])=O;
Properties
Chemical formula	Na3[Co(NO2)6]
Molar mass	403.933 g·mol−1
Appearance	Yellow crystals
Density	2.565 g/cm3
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	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). verify (what is ?) Infobox references

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]

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.
K₂Na[Co(NO₂)₆]·H₂O

Fragment of the Na₃Co(NO₂)₆ lattice, highlighting the CoN₆ and NaO₆ coordination spheres.^[6]

References

^ "C&L Inventory". echa.europa.eu.
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^ 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.
^ Vogel, A. I. (1951). Quantitative Inorganic Analysis (2nd ed.). Longmans Green and Co.
^ 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.
^ 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.

[1] "C&L Inventory". echa.europa.eu.

[G&W-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.

[Vogel-4] Vogel, A. I. (1951). Quantitative Inorganic Analysis (2nd ed.). Longmans Green and Co.

[Bailey_&_Stevens-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.

[1]

[2]

[3]

[4]

[5]

[6]

Synthesis and reactions

Application for analysis of potassium

See also

References