Equilibria among condensed phases and a multi-component solution using the concept of generalized species: Part I. Systems with mixed complexes
✍ Scribed by Alberto Rojas-Hernández; M. Teresa Ramírez; Ignacio González
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 935 KB
- Volume
- 278
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A method for the construction of predominance-existence diagrams (PED) in saturated multi-component solutions is discussed . The utilization of generalized species and equilibria, both in the solution and in the condensed phases, allows for the analysis of the saturation conditions from an intrinsic solubility generalized equilibrium Me ' ,j ¢ M(T)]. Likewise, an algorithm is proposed for the selection of the most insoluble condensed phase M~," )), from a condensed-phases diagram (CPD) dependent upon the parameters of the saturated solution . The CPD is constructed utilizing generalized phase interconversion equilibria, where the multi-conditional constants are dependent only on the buffering conditions; it is also necessary to consider the maximum number of phases that can coexist in the system (phase rule), the electroneutrality conditions for the condensed phases and the number of variables involved in the solubility equations . The consideration of mixed complexes in all phases with the proposed algorithm is simple as it is an extension of the concept of generalized species used previously .
In order to exemplify the proposed method, graphical representations of the following systems are discussed : Zn(II)-H 2 O-H, Zn(II)-H 2C 204-H20-H and Ca(II)-H 2C204-H 2SO4-H2O-H, where H 2C204 is oxalic acid .