Sodium cobaltinitrite

Sodium cobaltinitrite
Names
	IUPAC name Sodium hexanitritocobaltate(III)
Identifiers
CAS Number	13600-98-1 ;
3D model (JSmol)	Interactive image;
ChemSpider	13198283 ;
PubChem CID	16211641;
UNII	XO0NGY9EY7 ;
	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	Na; 3[Co(NO; 2); 6]
Molar mass	403.933 g·mol−1
Appearance	Yellow crystals
Density	2.565 g/cm3
Hazards
Safety data sheet	JT Baker MSDS
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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	Infobox references

Sodium cobaltinitrite is inorganic compound with the formula Na
3[Co(NO
2)
6]. The anion of this yellow-coloured salt consists of the transition metal nitrite complex [Co(NO
2)
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(H
2O)
6](NO
3)
2 + O
2 + 24 NaNO
2 → 4 Na
3[Co(NO
2)
6] + 8 NaNO
3 + 4 NaOH + 22 H
2O

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, K
2Na[Co(NO
2)
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.
K
2Na[Co(NO
2)
6] · H₂O

Fragment of the Na
3Co(NO
2)
6 lattice, highlighting the CoN
6 and NaO
6 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.. 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.

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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.. 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.

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Sodium cobaltinitrite

Topic: Chemistry

Contents

Synthesis and reactions

Application for analysis of potassium

See also

References