Volumetric and Viscometric Studies of 4-Aminobutyric Acid in Aqueous Solutions of Salbutamol Sulphate at 308.15,313.15 and 318.15K

Abstract

Abstract: Density (ρ) and viscosity (η) measurements were carried out for 4-aminobutyric acid in 0.0041,0.0125 and 0.0207 mol·L^-1 aqueous salbutamol sulphate at T=308.15,313.15 and 318.15K.The measured values of density and viscosity were used to estimate some important parameters such as apparent molar volume V_φ,limiting apparent molar volume V_φ⁰ transfer volume △V_φ⁰,hydration number n_H,second derivative of infinite dilution of partial molar volume with temperature ?²V_φ⁰/?T2,viscosity B-coefficients,variation of B with temperature dB/dT,free energy of activation per mole of solvent △μ₁^0* and solute △μ₂^0*,activation entropy △S₂^0* and activation enthalpy △H₂^0* of the amino acids.These parameters have been interpreted in terms of solute-solute and solute-solvent interactions and structure making/breaking ability of solutes in the given solution.

Key words: density, standard partial molar volume, hydration number, relative viscosity, B-coefficient, activation parameters

摘要： Density (ρ) and viscosity (η) measurements were carried out for 4-aminobutyric acid in 0.0041,0.0125 and 0.0207 mol·L^-1 aqueous salbutamol sulphate at T=308.15,313.15 and 318.15K.The measured values of density and viscosity were used to estimate some important parameters such as apparent molar volume V_φ,limiting apparent molar volume V_φ⁰ transfer volume △V_φ⁰,hydration number n_H,second derivative of infinite dilution of partial molar volume with temperature ∂²V_φ⁰/∂T²,viscosity B-coefficients,variation of B with temperature dB/dT,free energy of activation per mole of solvent △μ₁^0* and solute △μ₂^0*,activation entropy △S₂^0* and activation enthalpy △H₂^0* of the amino acids.These parameters have been interpreted in terms of solute-solute and solute-solvent interactions and structure making/breaking ability of solutes in the given solution.

关键词: density, standard partial molar volume, hydration number, relative viscosity, B-coefficient, activation parameters

K. Rajagopal, S. S. Jayabalakrishnan. Volumetric and Viscometric Studies of 4-Aminobutyric Acid in Aqueous Solutions of Salbutamol Sulphate at 308.15,313.15 and 318.15K[J]. , 2009, 17(5): 796-804.

References

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