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Sodium hexanitritocobaltate(III) is
inorganic compound
In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemi ...
with the formula . The anion of this yellow-coloured salt consists of the transition metal nitrite complex
In organometallic chemistry, transition metal complexes of nitrite describes families of coordination complexes containing one or more nitrite () ligands. Although the synthetic derivatives are only of scholarly interest, metal-nitrite complexe ...
. It was a reagent for the qualitative test for potassium
Potassium is the chemical element with the symbol K (from Neo-Latin '' kalium'') and atomic number19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmosp ...
and ammonium
The ammonium cation is a positively-charged polyatomic ion with the chemical formula or . It is formed by the protonation of ammonia (). Ammonium is also a general name for positively charged or protonated substituted amines and quaternar ...
ions.
Synthesis and reactions
The compound is prepared by oxidation of cobalt(II) salts in the presence ofsodium nitrite
Sodium nitrite is an inorganic compound with the chemical formula NaNO2. It is a white to slightly yellowish crystalline powder that is very soluble in water and is hygroscopic. From an industrial perspective, it is the most important nitrite ...
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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, is precipitated and weighed. In geochemical analysis, sodium cobaltinitrite is used to distinguish alkali feldspars from plagioclase feldspars in thin section.
See also
*Potassium hexanitritocobaltate(III)
Potassium hexanitritocobaltate(III) is a salt with the formula K3 o(NO2)6 It is a yellow solid that is poorly soluble in water. The compound finds some use as a yellow pigment under the name Indian Yellow.
The salt features potassium cations and ...
References
Cobalt complexes Sodium compounds Chemical tests Inorganic compounds Coordination complexes Nitrates {{Inorganic-compound-stub