EQUILIBRIA AMONG CONDENSED PHASES AND A MULTICOMPONENT SOLUTION USINGTHE CONCEPT OF GENERALIZED SPECIES .2. SYSTEMS WITH POLYNUCLEAR SPECIES

In this second part a general algorithm is presented which is based on the definition of total generalized species and equilibria and the co mbination of Charlot and Ringbom's approaches; this leads to the estab lishment of the relative importance of the chemical species present in a multi-component-multi-reacting system that includes complexation, p olynucleation and phase-formation phenomena. The definition of total g eneralized species [(dagger)M(tau)) and (dagger)M(c)(tau)] permits an expression to be obtained for the total generalized intrinsic solubili ty equilibria for the calculation of the saturation conditions in a so lution in spite of the presence of polynuclear species both in the sol ution and in the condensed phases. The symbol used for the total gener alized species implies that the subscripts for the polynucleation of M are included in the superscript dagger (dagger). The procedure used t o select the most insoluble phase from the condensed-phases diagram of this system was described in Part I. In order to exemplify the scope of the proposed algorithm, graphical representations of the following systems are discussed: Be(II)-H2O-H, Be(II)-H4PDTA-H2O-H, Ca(II)-H3PO4 -H2O-H and Mg(II)-H3PO4-NH3-H2O-H, where, H4PDTA is 1,3-diaminopropyle ne-N,N,N',N'-tetraacetic acid.