Abstract
The stepwise complex formation between Co(II), Mn(II) and azide ions has been studied potentiometrically by means of a glass electrode in aqueous sodium perchlorate medium of unit ionic strength at 25.0°C. In both of the systems investigated only the mononuclear complexes are formed in the concentrations range studied. No evidence has been found for the formation of polynuclear or acid complexes. The stability constants of Co(II) and Mn(II) azide systems are found to be β 1 = 5.5 ± 0.2 M −1, β 2 = 12 ± 1 M −2and β 1 = 3.8 n± 0.2 M −1, β 2 = 4 ± 1 M −2, respectively.
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