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Type: Artigo de periódico
Title: Calorimetric Study Of The Interaction Of Tri- And Tetrametaphosphate With Some Trivalent Cations
Author: Gushikem Y.
Giesse R.
Volpe P.L.O.
Abstract: Tri- and tetrametaphosphate were used in calorimetric titrations of Al3+, Y3+, La3+ and [Co(NH3)6]3+ in aqueous solutions. The enthalpies of reaction and equilibrium constants were determined for the complexation reactions. In every case, the ion pair of metal to cyclic phosphate in a 1 : 1 proportion is the complex species. The thermodynamic data as calculated by the least-squares method range between 2.28 and 37.8 kJ mole-1 for the enthalpies, and 56 and 190 J K-1 mole-1 for the entropies. These thermodynamic data indicate that the stability of these complexes is mainly due to the gain in entropy. © 1983.
Rights: fechado
Identifier DOI: 10.1016/0040-6031(83)80382-7
Date Issue: 1983
Appears in Collections:Unicamp - Artigos e Outros Documentos

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