Solubility Determination and Thermodynamic Modeling of Sodium Thioglycolate in Pure and Binary Solvent Mixtures from T = (293.15 to 333.15) K

The solubility of sodium thioglycolate in five pure solvents of water, methanol, ethanol and isopropyl alcohol, n-propanol and four binary solvent mixtures (water + methanol, water + ethanol, water + isopropyl alcohol, water + n-propanol) was determined within the temperature range from (293.15 to 333.15) K by using the gravimetrical method under atmospheric pressure (p = 0.1 MPa). The solubility of sodium thioglycolate in water, ethanol, isopropyl alcohol, and n-propanol increases with a rise of temperature, but the solubility decreases in methanol with increasing temperature. Meanwhile, in the binary solvent mixtures (water + methanol, water + ethanol, water + isopropyl alcohol, water + n-propanol), the solubility of sodium thioglycolate increases with increasing the mole fraction of water and with temperature. The modified Apelblat equation and van’t Hoff equation were applied to correlate the solubility of sodium thioglycolate in the five pure solvents, while in the binary solvent mixtures, the solubility was correlated by the modified Apelblat equation, CNIBS/R-K model, and Jouyban–Acree model. It was shown that the correlated results were in better agreement with the experimental data. Also, the mixing thermodynamic properties for sodium thioglycolate in the binary solvent mixtures were calculated.