The Distribution of 2-Thenoyltrifluoroacetone between Several Organic Solvents and an Aqueous Solution and Its Extraction of Sodium (I) into Methyl Isobutyl Ketone
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概要
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Aqueous solutions containing sodium hydroxide and sodium perchlorate at various mixing ratios, 1 M Na-(OH, ClO<SUB>4</SUB>), 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 (<I>K</I><SUB>D</SUB>+l)<I>K</I><SUB>a</SUB><SUP>−1</SUP> values, where <I>K</I><SUB>D</SUB> is the distribution constant and <I>K</I><SUB>a</SUB> is the acid dissociation constant of TTA, were obtained; they were, 10<SUP>7.17</SUP>(hexane), 10<SUP>7.74</SUP> (CCl<SUB>4</SUB>), 10<SUP>8.01</SUP> (C<SUB>6</SUB>H<SUB>6</SUB>) and 10<SUP>8.17</SUP> (CHCl<SUB>3</SUB>). From the values of <I>K</I><SUB>D</SUB> obtained in another study, the value of <I>K</I><SUB>a</SUB> was determined to be 10<SUP>−6.28</SUP>. 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, <I>K</I><SUB>ex</SUB>=[NaA]<SUB>org</SUB>/[Na<SUP>+</SUP>] [A<SUP>−</SUP>] (where A<SUP>−</SUP> is the TTA anion), was found from these results to be 10<SUP>0.86</SUP> in 1 M NaClO<SUB>4</SUB> and 10<SUP>0.79</SUP> at an infinite dilution.
- 公益社団法人 日本化学会の論文
著者
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Sekine Tatsuya
Department Of Applied Chemistry Kanagawa Institute Of Technology
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Takahashi Yoshihiro
Department Of Applied Physics Osaka City University
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Ihara Naohiko
Department of Chemistry, Science University of Tokyo
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Sekine Tatsuya
Departemnt of Chemistry, Science University of Tokyo
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