Abstract
It is assumed that the extraction constant, Kex, for the ion-pair extraction systems is made up of three independent constants (individual extraction constants), Ke, Ka and Ks, in accordance with the equation:log Kex=logKe+logKa+log Kswhere the subscripts c, a, and s denote cation, anion, and solvent, respectively. Log K values for several cations, anions, and solvents were calculated from experimental values of log Kex by tentatively assigning the log K values 1.0 and 0.0 to perchlorate and benzene, respectively, as reference values. The cations, anions and the solvents studied were Co (III) complexes of three 2-(2-pyridylazo)-5-diethylaminophenols, perchlorate and three anionic surfactants, and benzene, toluene, and chlorobenzene. The above equation is shown to be useful in estimating the unknown value of Kex from the constants assigned to each ion and the solvent.
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