Density and electrical conductivity have been measured for mixtures of 1,2-ethanediol (MEG) + water + NaCl + NaHCO3 with MEG concentrations from 0 to 100 mass % in salt-free solvent (wt %) and salt contents approaching the solubility limits at temperatures between 20 and 25 degrees C. Empirical correlations for density and conductivity in (MEG + water + salt) mixtures have been proposed. These correlations have been utilized in a model that can predict MEG concentration and salt content merely on the basis of density and conductivity of a solution. The model provides a fast, easy, and inexpensive method for prediction of MEG concentration, with an accuracy of (2 to 3) wt %.