Commentary concerning the “Measurement, correlation of the solubility and solution thermodynamics of 2-cyanoguanidine in (methanol + water) binary solvent systems from T = (283.15 to 343.15) K”

Errors are discovered regarding the published equation coefficients of Zhang and co-workers [J. Chem. Thermodynamics 89 (2015) 233-239] for mathematically describing the solubility behavior of 2-cyanoguanidine in neat solvents using the λh equation. The back-calculated values using the published equation coefficients are not the mole fraction solubility as stated in the published paper. Furthermore, the λ and h parameters were re-analysed according to the experimental solubility data.