Solubility and Solvation Parameters of Barium Sulphate in Mixed Ethanol-Water Mixtures at 301.15 K

The molar solubility of barium sulphate (BS) in mixed ethanol (EtOH)-water solvents was measured at 301.15 K . From the molar solubilities, the solvation parameters, activity coefficients, solubility products, free energies of solvation and transfer free energies for interaction of (BS) from water as reference solvent to mixed (EtOH-H2O) solvents were evaluated. The different volumes for (BS) like, molar , Van der Waals and electrostriction volumes were evaluated. All the different volumes for (BS) in mixed EtOH-H2O solvents indicate that the volumes increase by more adding alcohol favouring more energy required for solvation .The solvation free energy values were also discussed. This work explains two methodsused for the determination of(BS) concentrations in solutions and water, These two methods are volume determination and conductivity of the salt under consideration.This because barium salts are important salts responsible for the hardenss of water.