Thermodynamic properties of Sodium Dodecyl Sulfate aqueous solutions with Methanol, Ethanol, n-Propanol and iso-Propanol at different temperatures

The thermodynamic activation parameters such as, free energy (ΔG#), enthalpy (ΔH#) and entropy (ΔS#) change for the viscous flow of the ternary systems of Methanol, Ethanol, n-Propanol and iso-Propanol in 0.005 and 0.01 M aqueous Sodium Dodecyl Sulfate (SDS) were determined by using viscosity at 298.15–323.15 K with an interval of 5 K for the entire range of composition. The critical micelle concentration (CMC) of Sodium Dodecyl Sulfate (SDS) in water was found to be 0.0085 mol L−1 at 303.15 K. The concentration of SDS in pre-micellar and post-micellar regions of 0.005 and 0.01 M was used for the thermodynamic measurements. Free energy (ΔG#), increases rapidly with alcohol concentration and shows maxima in aqueous SDS rich region at 0.2–0.3 mol…