Abstract
The temperatures and stoichiometries of reaction of cobalt(II) nitrate, chloride and bromide have been established by analysis, infrared, X-ray diffractometry and thermogravimetric analysis. Tricobalt tetraoxide and nitrogen dioxide were produced together with oxygen and nitrite from the first two reactants, but with nitric oxide and bromine from the third reactant. Reaction pathways are suggested. Addition of potassium chloride caused a large (150–200°) increase in temperature of maximum reaction rate, which was ascribed to the formation of chloro “complexes”. No stabilisation was observed on addition of potassium bromide, though broadening of the weight loss maxima when chloride and bromide were present suggested the formation of mixed complexes.
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