Solid
sodium chloride solubility is measured at temperatures from
297 to 467 K at pressure of 6.45 MPa in ethane-1,2-diol/water mixed
solvent systems and at a concentration of cosolvent up to 75% w/w.
The corresponding solubility is also predicted from an extension of
the unified theory of electrolytes to mixed solvents (J. Phys. Chem. B201211690339042) for sodium and potassium chloride up to 473.15 K and
over the whole composition range of the cosolvent. A comparison of
the predicted solubility with the corresponding experimental values
from this study and the available literature data indicates good agreement
in all cases to well within the uncertainties of the experimental
data. Also, for the saturated solution of sodium and potassium chloride
in ethane-1,2-diol/water mixed solvent systems, the stoichiometric
activity coefficient values are estimated up to 473.15 K. These stoichiometric
activity coefficients, over the complete range of mole fraction of
the cosolvent, are then extended to all concentrations (0 ≤ m ≤ m
sat), and the results
are compared with the available data in the literature.