The vapor pressures of triacetin, triethylene glycol dinitrate, and metriol trinitrate for temperatures ranging from 11 to 75°C. and the constants of the integrated Clausius-Clapeyron equation are reported. Densities and refractive indices were also determined. The results obtained with metriol trinitrate are compared with those obtained by Piccardo.
NotesYol. 62 cribed to the formation of electrostatically associated neutral ion pairs. At high concentrations in isopropyl ether, the tetrachloroferrate ion2 *may be largely associated in the form of triple ions such as [H30+4H20 FeCl4-H30+.4H20]+ and [FeCl4~ 30+•4 20 FeCl4~] ~, associated in neutral iron pairs as [H30+-4H20 FeCl4~], and dissociated to a lesser extent as the ions H30+-4H20 and FeCl4~.With dilution, the conductance would be expected to go through a minimum as the triple ions dissociated and the concentration of neutral ion pairs increased. The final increase in conductance would follow an increased dissociation of neutral ion pairs with high dilution. Thus, the appearance of such minima in the conductance-dilution curves of the ethereal phases of the iron extraction system provides supporting experimental evidence for the "polymerization" theory which Myers, Metzler and Swift6 have proposed to account for the variation in the iron distribution coefficient with total iron concentration in ethereal extraction of iron from aqueous solution having constant initial hydrochloric acid concentrations.
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