1973 Volume 46 Issue 9 Pages 2761-2765
As regards the distribution of alkali metal picrates between water and methyl isobutyl ketone, distribution ratios of alkali metals and acid species were determined in the pH range 1.5–8.5. The extraction curves are almost the same for each alkali metal. Association constants of the picrates and the dissociation constant of picric acid in the organic phase were determined conductometrically. The association constants of picrates in the aqueous phase were determined with distribution coefficients by means of a solvent extraction method. The results obtained show that the picrates exist mainly in a dissociated form in both phases, whereas picric acid exists in a weakly dissociated form in the organic phase. The extractability of picrates is discussed on the basis of the extraction parameter proposed and compared with that of the nitrobenzene system.
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