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Cobalt Chlorate, Co(CoO3)2

Cobalt Chlorate, Co(CoO3)2, may be obtained by double decomposition of solutions of cobalt sulphate and barium chlorate. The solution, when Concentrated by exposure to sulphuric acid at temperatures below 18° C., yields unstable dull red rhombic crystals of the hexahydrate, Co(CoO3)2.6H2O. These melt at about 18.5° C. with separation of the tetrahydrate, Co(CoO3)2.4H2O, which is fairly stable at low temperatures, but becomes less so as the temperature rises up to about 61° C., at which point dehydration takes place. Even below this temperature a certain amount of decomposition takes place, with evolution of chlorine and oxygen, an oxide of cobalt being simultaneously produced. A bright red dihydrate, Co(CoO3)2.2H2O, may be obtained by prolonged exposure of the tetrahydrate to the action of phosphorus pentoxide.

The solubility of cobalt chlorate in water is as follows:

Temperature ° C010.51821354761
Grams of Co(CoO3)2 per 100 grams solution57.4561.8364.1964.3967.0969.6676.12
Solid phaseCo(CoO3)2.6H2OCo(CoO3)2.4H2O

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