Abstract
Problems are discussed regarding published mathematical representations by Huang et al. (2017) for describing how the measured mole fraction solubility varies with solvent composition in the binary (ethanol+ethyl acetate) and binary (acetone+ethanol) solvent systems. Several sets of published equation coefficients were found to give back-calculated mole fraction solubilities that exceeded unity. The published solubility data for hydroxyacetic acid dissolved in binary (ethanol+ethyl acetate) was reanalyzed and new curve-fitted equation coefficients were calculated for the simplified form of the Combined Nearly Ideal Binary Solvent (NIBS)/Redlich-Kister Model. Two simple methods for identifying possible errors in curve-fitted equation coefficients were also presented.
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