A SOLVENT-EXTRACTION STUDY OF THE THERMODYNAMICS OF P-IODOANILINE ANDOF THE PROTON IONIZATION OF THE P-IODOANILINIUM ION

The distribution coefficients of p-iodoaniline between a petroleum eth er fraction and aqueous sodium chloride solutions were determined at d ifferent temperatures. The activity coefficients of the amine in aqueo us sodium chloride solutions, and the salting coefficients were determ ined at different temperatures. The results agree with the Debye theor y of salt effects. The effect of sodium chloride on the proton ionizat ion of the p-iodoanilinium ion was studied at different temperatures, by a modified distribution method. Attention was directed to the choic e of the extracting solvent, the purity of the amine, and the analytic al method. K-m, K-n, (K-b)(m), (K-b,)(o), Delta G degrees, Delta H deg rees and Delta S degrees mere evaluated for the proton ionization of t he p-iodoanilinium ion.