Abstract
The theory underlying the partition of sparingly soluble reagents and their formally neutral metal chelates between an aqueous phase and any immisicible organic phase leads to a generalized extraction constant K * ex= K ex S n r,0/ S c,o where K ex is the conventional extraction constant and S r,o S c,o are the molar solubilities of reagent and metal complex, respectively, in the same organic solvent. The predicted constancy of K * ex is confirmed for measurements in seven solvents and for systems involving mono-, di- and tridithizonates of Ag +, Zn 2+ and Bi 3+, respectively.
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