Apparent molar volume and coefficients of Jones-Dole equation for the evaluation of ion- solvent interactions of barium chloride in aqueous 1, 4-dioxane and ethylene glycol solutions at T= (298.15 K to 313.15) K and at atmospheric pressure

The viscosity and density of barium chloride have been measured at T= (298.15-313.15) K in aqueous solutions of 1, 4-Dioxane (1,4-DO) and Ethylene glycol (EG). Jones–Dole equation was used to analyze the viscosity data. The apparent molar volume, V_ϕ limiting apparent molar volume, V_ϕ^0 are calculated from the density data. Limiting apparent molar expansibilities, E_ϕ^0 have been used to describe the temperture dependency of V_ϕ^0. The standard volume of transfer, ΔtV_ϕ^0 and viscosity B-coefficient of transfer, ΔtB of barium chloride from water to aqueous 1, 4-DO and EG solutions were systematizing the different types of interactions in the given solutions. The structure making and breaking capacity of solute in solutions was interpreted with the help of Helper equation. The positive value of (∂2V_ϕ^0/∂T2)p suggests the structure making nature for BaCl2 in given solution. It is observed that Friedman-Krishnan co-sphere model explains the increase in the transfer volume of BaCl2 with an increase in 1,4-DO and EG concentrations. The activation parameters of the viscous flow of the given solutions were calculated and interpreted using transition state theory.

Viscometric and Conductometric Studies of Doxycycline Hyclate in Water, Aqueous Glycine and L-Alanine Solutions at Different Temperatures

To investigate the behaviour of doxycycline hyclate in water, aqueous glycine and aqueous L-alanine solutions, the viscometric and conductometric studies have been conducted at different temperatures. Viscosity data has been used to derive the Jones-Dole viscosity B-coefficient, temperature derivative of B-coefficient (dB/dT), viscosity B-coefficient of transfer (ΔtrB), free energy of activation of viscous flow per mole of solvent (Δμ1 o*) and solute (Δμ2o*) respectively, activation entropy (ΔS2o*) and activation enthalpy (ΔH2o*). Conductance data has been used to compute Walden product (Λm oηo) and temperature coefficient of Walden product (dΛmoηo/dT) for doxycycline hyclate in water, and in aqueous glycine and aqueous L-alanine solution. The positive values of B-coefficient, ΔtrB indicate the prevailing of hydrophilic-ionic interactions in the systems under examination. The negative values of dB/dT and positive values of temperature coefficient of Walden product infer structure maker tendency of doxycycline hyclate in water, and in aqueous glycine and aqueous L-alanine solution. Transfer energy parameters indicate the breaking of intermolecular bonds in transition state which means that formation of activated complex is unfavourable

Exploration of Diverse Interactions of Some Vitamins in Aqueous Mixtures of Cysteine

The apparent molar volume (<em>Φ_V</em>), viscosity B-coefficient, molal refraction (<em>R</em>) and adiabatic compressibility (<em>Φ_K</em>) of Nicotinic Acid, Ascorbic Acid, and Folic Acid have been determined in 0.01, 0.03, 0.05 mol∙dm^-3 aqueous Cysteine solutions at 298.15 K from density (<em>ρ</em>), viscosity (<em>η</em>), refractive index (<em><em>n_D</em></em>) and speed of sound (<em>u</em>) respectively. The limiting apparent molar volumes (<em>Φ⁰_V</em>) and experimental slopes (<em>S*_V</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>Φ⁰_K</em>) of these vitamins were evaluated and discussed.

ThermodynamicProperties of Nicotinicacid in Dilute HCl and inaqueous NaCl solutions at (293.15, 298.15, 303.15 and 308.15)K

Apparent molar volume, V?, and viscosity B-coefficient of nicotinc acid in water and in aqueous NaCl solutions have been determined from density and viscosity measurements at (293.15, 298.15, 303.15 and 308.15) K. The experimental density data were evaluated by Masson equation, and the derived, apparent molar volume at infinite dilution, Vo?, and the slope Sv, were interpreted in term of solute-solvent and solute- solute interactions. Transfer apparent molar volumes at infinite dilution of nicotinic acid from water to NaCl solutions at various temperatures have been calculated.The viscosity data have been analyzed using Jones-Dole equation, and the derived parameters, Jones-Dolecoefficient, B,and Falkenhagen coefficient,A, have been also interpreted in terms of solute-solvent and solute-solute interactions respectively. The variation of B coefficient with temperature, (dB/dT), was also determined, the negative values indicate that nicotinic acid in aqueous NaCl solution is structure making. The results were interpreted in terms of complex vitamin-water-co-solute (NaCl) interactions. The free energy, enthalpy, andentropy of activation were calculated using the Nightingale, Benck, and Eyring equations. Free energies of activation of viscous flow ( *1) per mole, and, ( *2) per mole,of solvent and solute, respectively, were also calculated. The effects of soluteson the structure of water were interpreted in terms of viscositiesand the thermodynamic parameters.