Response to “Comments on ‘Thermodynamic Models for Correlation of Solubility of Hexaquocobalt(II) Bis(p-toluenesulfonate) in Liquid Mixtures of Water and Ethanol from 288.15 to 333.15 K’”

Abstract

The comments from Acree et al. [1], which are focused on ''Thermodynamic Models for Correlation of Solubility of Hexaquocobalt(II) Bis(p-toluenesulfonate) in Liquid Mixtures of Water and Ethanol from 288.15 to 333.15 K'' are appreciated. We have read it carefully and are particularly grateful to you for your hard work on this topic. In order to let other researchers and readers know better about our work, our explanations for the questions proposed by these comments are also given.In our recent paper [2] we reported the solubilities of hexaquocobalt(II) bis(p-toluenesulfonate) [Co(OTs) 2 Á6H 2 O] in water and ethanol mixtures containing molar fractions of 0-0.342 ethanol from 288.15 to 333.15 K using a synthetic method. The experimental data were correlated by the modified Apelblat equation, the Combined Nearly Ideal Binary Solvent Redlich-Kister (CNIBS/R-K) model, and a hybrid model that was a combination of the Jouyban-Acree and modified Apelblat models. The parameters of the above models were listed in Tables 3-5 in [2].Before the experiments, we did some pre-experiments that measured the solubility of Co(OTs) 2 Á6H 2 O in ethanol and found the solubility of Co(OTs) 2 Á6H 2 O increased little with increasing temperature. Therefore, we thought ethanol might not be a better choice as an antisolvent for crystallization of Co(OTs) 2 Á6H 2 O in industry, and we decided to measure the solubilities of Co(OTs) 2 Á6H 2 O in water rich binary solvents. Based on the experimental data, we found that the solubility tends to level out when the molar fraction of ethanol (x 2 ) is in the range of 0.228-0.342. According to Liu et al. [3], some of the ethanol and water molecules in the mixture will form (water) 2 -ethanol clusters. Therefore, the addition of ethanol leads to the formation of more clusters. Combined with our research, we held the idea that these new clusters (formed by ethanol and water molecules, the molar fraction of ethanol is * 0.333, which is quite close to 0.342) were adverse to the increase of the This response refers to the commentary article at