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|Type:||Artigo de periódico|
|Title:||Calorimetric Study Of The Interaction Of Tri- And Tetrametaphosphate With Some Trivalent Cations|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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