Sodium cobaltinitrite
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| Names | |
|---|---|
| IUPAC name
sodium hexanitritocobaltate(III) | |
| Identifiers | |
13600-98-1  | |
| 3D model (Jmol) | Interactive image |
| ChemSpider | 13198283  |
| ECHA InfoCard | 100.033.692 |
| 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). | |
| verify (what is ?) | |
| 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
- ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 0-08-037941-9.
- ↑ 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.