Abstract
This paper reports the results on the molar solubility (MS), refractive index (RIN) and molar electrical con- ductance (EC) of the saturated NaF at different temperatures (293.15, 303.15 and 313.15 K) in mixed ethanol (ETOH) -water solvents. From the experimental part, the molar refraction (RM), limiting molar conductance (LEC), association constants (KASS), free energies of association (GASS) were determined for all solutions by using simple equation from the Shedlovslay model of conductivity.Results predicted the exothermic behaviour of the process in most of the cases. All the measured and calculated parameters for solvation (solubility parameters) and association (conductivity parameters) are in- creased by increasing the mole fraction of ethanol in the mixtures. This indicates more solute-solvent interaction by more adding ethanol in the mixed solvents.The solubility; conductivity and different thermodynamic data calculated here can easily used for the industial determination of sodium fluoride.
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