Thermodynamics of Aqueous Nitrilotriacetic Acid (NTA) Systems: Apparent and Partial Molar Heat Capacities and Volumes of Aqueous HNTA2−, NTA3−, MgNTA−, CoNTA−, NiNTA− and CuNTA− at 25 °C |
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| Authors: | Dzmitry Malevich Zhongning Wang Peter R. Tremaine |
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| Affiliation: | (1) Department of Chemistry, University of Guelph, Guelph, Ontario, Canada, N1G 2W1;(2) Department of Chemistry, Memorial University of Newfoundland, St. John’s, Newfoundland, A1B 3X7, Canada;(3) Present address: RMC Fuel Cell Research Center, Kingston, ON, Canada, K7L 5L9 |
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| Abstract: | Apparent molar heat capacities and volumes have been determined for aqueous Na2HNTA, Na3NTA, NaMgNTA, NaCoNTA, NaNiNTA and NaCuNTA at 25 °C. The experimental results have been analyzed in terms of Young’s rule with an extended Debye–Hückel equation to obtain standard partial molar heat capacities C p o and volumes V o for the species HNTA2−(aq), NTA3−(aq), MgNTA−(aq), CoNTA−(aq), NiNTA−(aq) and CuNTA−(aq), at ionic strengths I = 0 and I = 0.1 mol⋅kg−1. Values of C p o and V o were combined with the literature data to estimate the stability constants of the NTA complexes at temperatures up to 100 °C. |
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| Keywords: | Aqueous Apparent molar heat capacities Apparent molar volumes Standard partial molar properties Nitrilotriacetic acid NTA Transition metal— NTA complexes |
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