The protonation of 3-amino-1,2,4-triazole was studied potentiometrically (glass electrode) in sodium chloride and calcium chloride solutions, 0.13 I 0.92M, at 10, 25, 37 and 45 degrees . The effect of the background electrolyte on the protonation constants is explained by a complex formation model. The species CaL(+), CaHL(2+) and H(2)LCl (HL = 3-amino-1,2,4-triazole) are proposed. Stability constants, together with their dependence on temperature (DeltaH degrees ) and on ionic strength, are reported for the protonated and complex species.
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