Sodium cobaltinitrite

Sodium cobaltinitrite
Names
IUPAC name
sodium hexanitritocobaltate(III)
Identifiers
13600-98-1 N
ChemSpider 13198283 YesY
Jmol 3D model Interactive image
PubChem 16211641
Properties
CoN6Na3O12
Molar mass 403.93 g·mol−1
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 a coordination compound with the formula Na3Co(NO2)6. The anion of this yellow-coloured salt consists of a cobalt(III) center N-bonded to six nitrito ligands. It is 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]

See also

References

  1. Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
  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.
  3. Vogel, A. I. (1951). Quantitative Inorganic Analysis (2nd ed.). Longmans Green and Co.
  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.
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