Cobalt hexammine chloride

Prepd by reacting a cobalt nitrate hexanydrate soln with AN and coned ammonia and then air oxidizing Co (II) to Co (III) or treating hexammine cobalt (II) chloride with coned nitric acid (Ref 1) by reacting Co(NH2)3 with AN in liq ammonia at 100° in an autoclave (Ref 3)... 

Hexammine cobalt(III) chloride [10534-89-1] M 267.5. cooling. [Bjemim McReynolds Inorg Synth II 217 1946.]... 

Hexammino-vanadium Trichloride, [V(NH3)6]C13.—The similarity between the trichlorides of iron and vanadium is further shown in their behaviour towards ammonia. At ordinary temperatures ammonia reacts with vanadium trichloride to produce vanadium nitride, VN, and ammonium chloride, but if liquid ammonia is poured over vanadium trichloride, a quantitative yield of a reddish-brown salt, [V(NH3)6]C13, is obtained, which recalls the hexammines of cobalt and chromium. The ammonia molecules are not, however, very firmly held, and the compound is, therefore, more comparable with the corresponding hexammine of ferric chloride, [Fe(NH3)6]Cl3. 

In 1891 Werner began to apply himself to the problem of valence with his Contributions to Theory of Affinity and Valence. At that time Kekul s principle of fixed valence, so useful in organic chemistry, was being applied by chemists such as Blomstrand and Jorgensen to complex metal salts resulting in formulations of, for example, hexammine cobaltic chloride as ... 

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

Determination of purity. The purity of the product may be tested by determining the percentage of ionized chloride. This testing may be done gravimetrically by precipitation with silver nitrate, but volumetric methods are faster and are adequate here. Titration with silver nitrate is not easy, since none of the usual indicators work satisfactorily in the solution of the hexammine-cobaltic salt however, the chloride can be easily and accurately titrated with mercuric nitrate. 

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