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 318.15 K.. 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_φ~0, transfer volume ΔV_φ~0, hydration number nH , second derivative of infinite dilution of partial molar volume with temperature (e)~2V_φ~0 /(e)T~2 , viscosity B-coefficients, variation of B with temperature dB/dT, free energy of activation per mole of solvent Δμ_1~(0*) and solute Δμ_2~(0*), activation entropy ΔS_2~(0*) and activation enthalpy ΔH_2~(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.
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