Abstract
Ordering in NaCl--AlCl{sub 3} melts leads to sharp minima in the solubility of divalent chlorides MCl{sub 2} (e.g., CoCl{sub 2}, and NiCl{sub 2}) near the 50-50 mole % composition. The composition dependence of these solubilities in acids melts can be described by using either the coordination cluster theory or the solubility product principle. The magnitudes of the solubility products are largely related to the fact the standard free energy of formation of 2NaNlCl{sub 4} form 2NaCl and 2AlCl{sub 3} is considerably more negative that the corresponding free energy for N (AlCl{sub 4}){sub 2}. In basic melts solubilities are largely related to the formation of the associated species MCI{sup +}, MCI{sup 2}, MCI {sup {minus}3} and MCI {sub 4}{sup {minus}2}, which appear to have very large formation constants. 15 refs., 3 figs.
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