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