SODIUM COBALTINITRITE

Chemical properties

SODIUM COBALTINITRITE is deep yellow to brown crystalline powder

The Uses of SODIUM COBALTINITRITE

SODIUM COBALTINITRITE is used in the detection Potassium.

The Uses of SODIUM COBALTINITRITE

Nitrosation reagent for the conversion of aromatic amines to 1,3-diaryltriazenes with excellent yield.1

The Uses of SODIUM COBALTINITRITE

For the detection of potassium with which it forms a slightly soluble compound.

What are the applications of Application

Sodium hexanitrocobaltate(III) is a nitrosation reagent

Preparation

Sodiumhexanitrocobaltate(III) ("sodiumcobaltinitrite") Na3Co(N02)6 is a well-known orange solid which precipitates potassium ions from aqueous solution as K3Co(NO2)6. It is prepared by blowing air through a mixture of cobalt(II) nitrate and sodium nitrite solutions in the presence of acetic acid:
2[Co(H20)6]²⁺ +12NO₂^- +2CH3COOH + 1/2O2 → 2[Co(NO)2)6]^3- +2CH3COO^-+ 13H2O
after filtration of any precipitated potassium or ammonium salts, the sodium salt is precipitated by the addition of ethanol.

Purification Methods

Dissolve the salt (ca 60g) in H2O (300mL), filter to obtain a clear solution, add 96% EtOH (250mL) with vigorous stirring. Allow the precipitate to settle for 2hours, filter it off, wash it with EtOH (4 x 25mL), twice with Et2O and dry it in air [Glemser in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol II p 1541 1965]. It forms yellow to brown crystals which are very soluble in H2O, are decomposed by acid and form an insoluble K salt. Used for estimating potassium.