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'''Sodium cobaltinitrite''' is a ] with the formula Na<sub>3</sub>Co(NO<sub>2</sub>)<sub>6</sub>. The anion of this yellow-coloured salt consists of a cobalt(III) center bound to six nitrito ligands. It is used as a qualitative test for ] and ] ions (provided that certain other cations are absent).<ref>G. Svelha, Vogels textbook of macro and semimicro qualitative inorganic analysis, (5th edition), Longman Group,ISBN 0-583-44367-9 {{Please check ISBN|reason=Check digit (9) does not correspond to calculated figure.}}</ref> Although the sodium salt is soluble in water, those of potassium and ammonium are insoluble. The potassium and ammonium salts are precipitated as yellow solids. This compound is also frequently used in geology to distinguish alkali feldspars from plagioclase feldspars in thin section. <ref name = "Bailey & Stevens">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.</ref> '''Sodium cobaltinitrite''' is a ] with the formula Na<sub>3</sub>Co(NO<sub>2</sub>)<sub>6</sub>. 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 ] and ] ions (provided that certain other cations are absent).<ref>G. Svelha, Vogels textbook of macro and semimicro qualitative inorganic analysis, (5th edition), Longman Group,ISBN 0-583-44367-9 {{Please check ISBN|reason=Check digit (9) does not correspond to calculated figure.}}</ref>


The compound is prepared by oxidation of cobalt(II) salts in the presence of potassium nitrite]]:<ref>O. Glemser "Sodium Hexanitritocobaltate(III)" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1541.</ref>
⚫ Sodium cobaltinitrite also forms the basis of a quantitative determination of potassium. However under the recommended reaction conditions the insoluble double salt, K<sub>2</sub>Na.H<sub>2</sub>O is precipitated and weighed.<ref name = "Vogel">A.I. Vogel,(1951), Quantitative Inorganic analysis, (2d edition), Longmans Green and Co</ref> Also thallium(I) can be determined as the precipitate is Tl<sub>3</sub>.<ref name = "Vogel"/>
:4 (NO<sub>3</sub>)<sub>2</sub> + O<sub>2</sub> + 24 NaNO<sub>2</sub> → 4 Na<sub>3</sub> + 8 NaNO<sub>3</sub> + 4 NaOH + 22 H<sub>2</sub>O

==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.<ref name = "Bailey & Stevens">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.</ref>

⚫ Sodium cobaltinitrite also forms the basis of a quantitative determination of potassium. Under the recommended reaction conditions the insoluble double salt, K<sub>2</sub>Na.H<sub>2</sub>O is precipitated and weighed.<ref name = "Vogel">A.I. Vogel,(1951), Quantitative Inorganic analysis, (2d edition), Longmans Green and Co</ref> Also thallium(I) can be determined as the precipitate is Tl<sub>3</sub>.<ref name = "Vogel"/>


==See also== ==See also==

Revision as of 23:56, 31 March 2014

Sodium hexanitritocobaltate(III)
Names
IUPAC name sodium hexanitritocobaltate(III)
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.692 Edit this at Wikidata
PubChem CID
CompTox Dashboard (EPA)
InChI
  • InChI=1S/Co.6NO2.3Na/c;6*2-1-3;;;/q-3;;;;;;;3*+1Key: IMBXIBFCGMYSME-UHFFFAOYSA-N
  • InChI=1/Co.6NO2.3Na/c;6*2-1-3;;;/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*+1Key: IMBXIBFCGMYSME-PEVTYUNUAJ
SMILES
  • ...O=()(()=O)((=O))(()=O)(()=O)()=O
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
Chemical compound

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

  1. G. Svelha, Vogels textbook of macro and semimicro qualitative inorganic analysis, (5th edition), Longman Group,ISBN 0-583-44367-9
  2. O. Glemser "Sodium Hexanitritocobaltate(III)" Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 1541.
  3. 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.
  4. ^ A.I. Vogel,(1951), Quantitative Inorganic analysis, (2d edition), Longmans Green and Co


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