Phase Equilibrium in the CsCl + YbCl3 + HCl (11.3 %) + H2O System at 298.2 K and Thermodynamic Properties of New Solid Phase Compounds

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• 作者：Zhan-Ping Qiao ; Hai-quan Xie ; Xin Chen ; Hui Wang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2013
• 出版时间：November 14, 2013
• 年：2013
• 卷：58
• 期：11
• 页码：3125-3129
• 全文大小：271K
• 年卷期：v.58,no.11(November 14, 2013)
• ISSN：1520-5134

文摘

Solubility was studied in the CsCl + YbCl₃ + HCl + H₂O quaternary system along the (11.3 %) HCl section at 298.2 K using the isothermal solubility method, and the corresponding phase diagram was plotted. The compositions of solid phases were determined by the Schreinemaker鈥檚 wet residues technique. The system was complicated with four equilibrium solid phases CsCl, Cs₄YbCl₇路4H₂O, Cs₂YbCl₅路5H₂O, and YbCl₃路6H₂O. The compound Cs₄YbCl₇路4H₂O was incongruently soluble, and the compound Cs₂YbCl₅路5H₂O was congruently soluble in the system. The new solid phase compounds were characterized by chemical analysis, X-ray diffraction (XRD), and thermogravimetric/differential thermogravimetric (TG-DTG) techniques. The standard molar enthalpies of solution of Cs₄YbCl₇路4H₂O and Cs₂YbCl₅路5H₂O in water were measured to be (18.19 卤 0.47) and (13.22 卤 0.27) kJ路mol^鈥? by microcalorimetry under the condition of infinite dilution, and their standard molar enthalpies of formation were determined as being 鈥?(4039.2 卤 2.2) kJ路mol^鈥? and 鈥?(3469.2 卤 1.3) kJ路mol^鈥?, respectively.