Potassium cobalt nitrite chloride

Potassium Cobaltous Nitrite, 2KN02.Co(N02)2. H20, is obtained by adding potassium nitrite to a neutral solution of cobalt chloride. It is precipitated as a yellow, hydrated mass, which is soluble in hot water to a red solution.6... 

Addition of potassium nitrite, KNO2 to a solution of cobalt(lI) chloride yields yellow crystalline potassium hexanitrocobaltate(lIl), K3Co(N02)e. 

More complex salts are also known belonging to the series. For instance, if a solution of nitro-pentammino-cobaltic chloride be treated with an aqueous solution of sodium cobaltic nitrite, Na3Co(N02)6, a yellowish-brown crystalline precipitate of nitro-pentammino-cobaltic cobalti-nitrite, [Co(NH3)5(N02)]3[Co(N02)6]2, is formed. Also the corresponding ferrocyanicle may be prepared by treating nitro-pentammino-salts with potassium ferrocyanide. The compound obtained is a reddish-yellow substance of composition [Co(NH3)5(NO,)], [Fe(CN )6].6H20. 

O. L. Erdmann reported potassium cobaltous tetranitrite, K2Co(N02)4, or 6K0H.3Co3(N02)2, to be separated as a yellow crystalline powder when soln. of cobaltous chloride and an excess of potassium nitrite are mixed. No oxygen is absorbed from the air during its formation, and O. L. Erdmann, and S. P. Sadtler used an atm. of carbon dioxide. The salt was also prepared by A. Stromeyer, and C. D. Braun. The salt is insoluble in cold water, but soluble in hot water, forming a red soln. It forms a violet soln. if potassium acetate is present, containing cobaltous salts. The salt decomposes when heated. C. D. Braun said that cobaltic hydroxide is precipitated when the soln. is boiled with potash-lye. 0. L. Erdmann said that the cobalt is not contained in the salts as a base in the... 

Several preparations of salts of the czs-dinitrobis(ethyl-enediamine)cobalt(III) ion have been reported in the literature. The most usual is that of Werner/ modified by Holtzclaw, Sheetz, and McCarty, beginning with potassium hexanitrocobaltate(III). However, this method makes use of a starting material which is difficult to prepare in high purity and to dry thoroughly, involves critical temperature control, and produces a yield of about 15%. The following procedure, which utilizes ethylenedi-amine)cobalt(III) chloride as the starting material, provides a 60% yield of cfs-dinitrobis(ethylenediamine)cobalt-(III) nitrite. The nitrite is then easily converted to the nitrate. 

Name of Complex Salt Hexammine cobaltic chloride Chloropentammine cobaltic chloride Dichlorotetrammine cobaltic chloride Trichlorotriammine cobaltic chloride Potassium tetranitrodiarnmine cobaltiate Potassium cobalti-nitrite... 

Ammonium Tetranitrito - diammino - cobaltate, [Co(XH3)2 (N02)4]NH4, is prepared from cobaltous chloride by mixing an aqueous solution of the salt with aqueous ammonium-chloride solution, sodium nitrite, and ammonia, and oxidising the mixture by passing air through it for several hours. The solution is allowed to stand in air for some days, when crystals gradually separate. These are collected, washed, and reerystallised from water.3 The substance crystallises in brown rhombic prisms. It is decomposed on treatment with potassium hydroxide with evolution of ammonia, and a cold solution reacts with ammonia in presence of ammonium salts, with formation of flavo-dinitro double salts, of which [Co(NH3)4(N02)2][Co(NH3)2(N02)4] is typical. Oxalic acid transforms it into the oxalato-dinitrito-diammino-salt, [Co(NH3)2(N02)2(C204)]NH4. 

Potassium Tetranitrito - diammino - cobaltate, [Co(NH3)3 (N02)4]K.—The salt is produced by treating cobaltous chloride with excess of ammonium chloride and potassium nitrite, and warming the liquid to 50° C. It is then allowed to stand at low temperature for several hours, when crystals separate. They are dissolved in boiling water, filtered. and cooled, when lustrous browm rhombic crystals separate. The salt may be obtained from the ammonium salt by treating a warm aqueous solution with potassium acetate. 

Solutions of cobalt salts (1 20) in 2.7 A hydrochloric acid yield a red precipitate when heated on a steam bath with an equal volume of a hot, freshly prepared 1 10 solution of 1-nitroso-2-naphthol in 9 A acetic acid. Solutions of cobalt salts yield a yellow precipitate when saturated with potassium chloride and treated with potassium nitrite and acetic acid. 

NITROTO de PLOMA (Spanish) (10099-74-8) A strong oxidizer. Violent reaction with reducing agents, combustible materials, ammonium thiocyanate, cobaltic potassium nitrite (C.I. pigment yellow), cyclopentadienyl sodium, red hot carbon, lead(II) phosphinate, phosphorus, tin(II) chloride. Incompatible with aluminum, ammonia, citric acid, hydrozoic acid, metal phosphinates, methyl isocyanoacetate, sodium peroxyborate, potassium acetate, strong oxidizers, trinitrobenzoic acid, urea nitrate,... 

Bismuth Cobalt phosphate (ous) Cobalt potassium nitrite Ferric chloride Manganese dioxide... 

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