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Walden product, ion-solvent interactions and solvent structure in water-rich mixtures ionic conductances in water-sulfolane, water-acetonitrile and water-dimethylsulfoxide

✍ Scribed by Giuseppe Petrella; Mario Petrella

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
724 KB
Volume
27
Category
Article
ISSN
0013-4686

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✦ Synopsis

Conductance measurements are reported for several salts in binary aqueous mixtures containing up to 60 mole y0 sulfolane, 20 mole % acetonitrile and 20 mole % dimathylsulfoxida. The variations of R = (A$~o),/(A~qo), with solvent composition have been compared with those observed in other water-rich mixtures. Alkali cations show R values greater than one with maxima in all the solvent mixtures. This tebaviour has been discussed in terms'of "sorting", 'averaging" and "steric" effects. Contrary to what happens to alkali cations, halide ions show R values greater or lesser than one according to whether the organic solvent respectively increases or decreases water structure. On these bases we suggest that conductometric behaviour of the halide ions may be indieative of the effect of the cosolvent on the water structure in water-rich mixtures and that DMSO is a water structure breaker.

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Ion-solvent interaction: Viscosity and apparent molar volume of univalent electrolytes in dioxane-water mixtures at different temperatures
✍ N.C. Das; P.B. Das 📂 Article 📅 1980 🏛 Elsevier Science 🌐 English ⚖ 321 KB

The viscosity and apparent molar volume ofNaC1, NaBr, NaNO,, KCI, KBr and KNO,, at mass fractions of dioxane of lo,20 and 309/ have been studied at 30,35,40 and 45°C. The values of the A and E coefficients of the viscosity equation indicate ion-ion and ion-solvent interactions. The limiting apparent