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IUPAC name sodium hexanitritocobaltate(III) | |
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3D model (JSmol) | |
ChemSpider | |
ECHA InfoCard | 100.033.692 |
PubChem CID | |
CompTox Dashboard (EPA) | |
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Properties | |
Chemical formula | CoN6Na3O12 |
Molar mass | 403.933 g·mol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). N 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 used as a qualitative test for potassium and ammonium ions (provided that certain other cations are absent).
The compound is prepared by oxidation of cobalt(II) salts in the presence of potassium nitrite]]:
- 4 (NO3)2 + O2 + 24 NaNO2 → 4 Na3 + 8 NaNO3 + 4 NaOH + 22 H2O
Application for analysis of potassium
Although the sodium salt is soluble in water, those of potassium and ammonium are insoluble. The potassium and ammonium salts precipitate from water as yellow solids. This compound is also frequently used in geology to distinguish alkali feldspars from plagioclase feldspars in thin section.
Sodium cobaltinitrite also forms the basis of a quantitative determination of potassium. Under the recommended reaction conditions the insoluble double salt, K2Na.H2O is precipitated and weighed. Also thallium(I) can be determined as the precipitate is Tl3.
See also
References
- G. Svelha, Vogels textbook of macro and semimicro qualitative inorganic analysis, (5th edition), Longman Group,ISBN 0-583-44367-9
- O. Glemser "Sodium Hexanitritocobaltate(III)" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1541.
- E.H. Bailey and R.E. Stevens,(1960), Selective staining of K-feldspar and plagioclase on rock slabs and thin sections, American Mineralogist vol. 45, pp. 1020-1025.
- ^ A.I. Vogel,(1951), Quantitative Inorganic analysis, (2d edition), Longmans Green and Co
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