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Ammonium Cobalt Sulphate, (NH4)2SO4.CoSO4

Ammonium Cobalt Sulphate, (NH4)2SO4.CoSO4.6H2O, is obtained by evaporation of mixed solutions of ammonium and cobalt sulphates in equivalent proportions. The crystals are red, exhibiting pleo- chroism, and of density 1.873. Their solubility in water is as follows:

Temperature ° C010182335456075
Grams of (NH4)2SO4.CoSO4. in 100 grams of water8.911.615.217 119.625 034.543.3


An anhydrous double salt, of composition 2(NH4)2SO4.3CoSO4, is obtained by heating anhydrous cobalt sulphate13 with excess of ammonium sulphate. In contact with water it readily hydrates with evolution of heat.

Lithium sulphate does not appear to unite with cobalt sulphate on heating in the anhydrous condition, but sodium sulphate yields the double salt, CoSO4.3Na2SO4, which decomposes at 425° C. With potassium sulphate two compounds are obtained, namely, CoSO4.K2SO4, which decomposes above 560° C., and 2CoSO4.K2SO4, which crystallises out at 736° C.

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