Transport parameters of LiCl and LiBr in aqueous mixtures with organic solvents of moderate to low permittivities
文献信息
The electromotive forces (emf) EA and EC of the following concentration cells with transference: respectively (where X=Cl, Br), combined with the emfs EMAX of the corresponding double cell without transference: ∣AgX∣LiX(m2)∣LixHg1-x have been measured at LiX molalities m (m1 fixed and m2 varied, with m2>m1) in 14 solvent mixtures pertaining to the three aqueous–organic solvent systems (acetonitrile+water), (1,4-dioxane+water) and (methanol+water) up to the 0.8 mass fraction of organic component. For all of the cases studied the EAvs. EMAX relation is a curve reaching a straight line asymptotically at low LiX molalities. The resulting ionic transference numbers t of LiX show a type of curvilinear dependence on the mass fraction of the organic component which shows analogies with that of the other alkali halides hitherto studied, but is quite distinct from that of HCl. Such a dependence is also analyzed in terms of solvation parameters and the mechanism of ionic motion, with account being taken of Stokes' law ionic radii.
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