Viscosity B-coefficients of lithium, sodium, and potassium bromide in (30, 60, and 90) % aqueous 1,3dioxolane solutions have been determined at (298.15 and 308.15) K from density and viscosity measurements employing the Jones-Dole, Breslau-Miller, and Vand equations. B-coefficients thus obtained were compared. Furthermore, the applicability of the Moulik equation was shown by linear plots of relative viscosity and concentration values in their square terms. It has been found that the B-coefficients vary with the size of the cations, which suggests a structure-promoting tendency for all of the salts and for all of the concentrations.
The apparent molar volume (<em>Φ<sub>V</sub></em>), viscosity B-coefficient, molal refraction (<em>R</em>) and adiabatic compressibility (<em>Φ<sub>K</sub></em>) of Nicotinic Acid, Ascorbic Acid, and Folic Acid have been determined in 0.01, 0.03, 0.05 mol∙dm<sup>-3</sup> aqueous Cysteine solutions at 298.15 K from density (<em>ρ</em>), viscosity (<em>η</em>), refractive index (<em><em>n<sub>D</sub></em></em>) and speed of sound (<em>u</em>) respectively. The limiting apparent molar volumes (<em>Φ<sup>0</sup><sub>V</sub></em>) and experimental slopes (<em>S*<sub>V</sub></em>), derived from the Masson equation, have been interpreted in terms of solute-solvent and solute-solute interactions respectively. The viscosity data were analyzed using the Jones-Dole equation and the derived parameters <em>A</em> and <em>B</em> have also been interpreted in terms of solute-solute and solute-solvent interactions respectively in the solutions. Using the Lorentz-Lorenz equation, molal refractions (<em>R</em>) have been calculated. At infinite dilution, limiting apparent molar adiabatic compressibilities (<em>Φ<sup>0</sup><sub>K</sub></em>) of these vitamins were evaluated and discussed.
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