Sodium cobaltinitrite

Names
	IUPAC name sodium hexanitritocobaltate(III)
Identifiers
CAS Number	13600-98-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	13198283 ;
ECHA InfoCard	100.033.692
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	CoN6Na3O12
Molar mass	403.933 g·mol−1
Density	2.565 g/cm3
Hazards
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).
	(what is ?)
	Infobox references

Sodium cobaltinitrite is inorganic compound with the formula Na₃Co(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.^[1]

Synthesis and reactions[]

The compound is prepared by oxidation of cobalt(II) salts in the presence of sodium nitrite:^[2]

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.^[3] In geochemical analysis, sodium cobaltinitrite is used to distinguish alkali feldspars from plagioclase feldspars in thin section.^[4]

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.^[5]

References[]

^ 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. 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.
^ 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.CS1 maint: uses authors parameter (link)

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[G&W-1] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[2] Glemser, O. (1963). "Sodium Hexanitritocobaltate(III)". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry. 1 (2nd ed.). New York, NY: Academic Press. p. 1541.

[Vogel-3] Vogel, A. I. (1951). Quantitative Inorganic Analysis (2nd ed.). Longmans Green and Co.

[Bailey_&_Stevens-4] 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.

[5] 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.CS1 maint: uses authors parameter (link)

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Sodium cobaltinitrite

Contents

Synthesis and reactions[]

Application for analysis of potassium[]

See also[]

References[]