The Distribution of 2-Thenoyltrifluoroacetone between Several Organic Solvents and an Aqueous Solution and Its Extraction of Sodium (I) into Methyl Isobutyl Ketone

Aqueous solutions containing sodium hydroxide and sodium perchlorate at various mixing ratios, 1 m Na-(OH, ClO4), were equilibrated with several organic solvents containing 2-thenoyltrifluoroacetone (TTA) at 25°. From the measurements of the hydrogen-ion concentration of the aqueous phase, the (KD+l)Ka−1 values, where KD is the distribution constant and Ka is the acid dissociation constant of TTA, were obtained; they were, 107.17(hexane), 107.74 (CCl4), 108.01 (C6H6) and 108.17 (CHCl3). From the values of KD obtained in another study, the value of Ka was determined to be 10−6.28. However, a much lower value than that expected was obtained for the MIBK system; this was due to the extraction of sodium (I) with TTA. The extraction was also confirmed by the distribution experiments of sodium (I). The extraction constant, Kex=[NaA]org/[Na+] [A−] (where A− is the TTA anion), was found from these results to be 100.86 in 1 M NaClO4 and 100.79 at an infinite dilution.