, Volume 54, Issue 2, pp 332-339
Date: 06 May 2009

Thermodynamic characteristics of complex formation in the nickel(II) ion-β-alanine systems in aqueous solution

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Heats of reactions between a nickel(II) ion and β-alanine were measured calorimetrically at 288.15, 298.15, and 308.15 K and ionic strengths of 0.5, 1.0, and 1.5 (KNO3). Thermochemical data were processed with account for stepwise equilibria; attendant protolytic processes were taken into account together with complexing reactions. Extrapolation to the zeroth ionic strength with the use of a one-parameter equation gave standard thermodynamic characteristics of complex formation in the system. The influence of the supporting electrolyte and temperature on the heats of complex formation reactions was considered. Standard enthalpies of formation were calculated for NiAla+, NiAla2, and NiAla 3 species.