Water Activity Measurements by the Isopiestic Method for the MCl鈥揅aCl2鈥揌2O (M = Na, K) Systems at 323.15 K

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• 作者：Haijun Han ; Lijiang Guo ; Dongdong Li ; Ouyang Dong ; Yan Yao ; Ning Zhang ; Dewen Zeng
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：August 13, 2015
• 年：2015
• 卷：60
• 期：8
• 页码：2285-2290
• 全文大小：273K
• ISSN：1520-5134

文摘

In this work, the water activities of the NaCl鈥揅aCl₂鈥揌₂O and KCl鈥揅aCl₂鈥揌₂O ternary systems and of their sub-binary systems NaCl鈥揌₂O and KCl鈥揌₂O were measured using an isopiestic method at 323.15 K. The isopiestic composition line for the NaCl鈥揅aCl₂鈥揌₂O system was found to obey the Zdanovskii rule very well, whereas the KCl鈥揅aCl₂鈥揌₂O system deviated slightly. The addition of NaCl to an aqueous solution of CaCl₂ decreased its water activity for all CaCl₂ molalities. However, KCl was found to decrease and increase the water activity at low and high CaCl₂ molality, respectively. The turning point appears at 8.0 mol路kg^鈥? CaCl₂ solution. The Pitzer鈥揝imonson鈥揅legg (PSC) model was applied to represent the water activity of the two ternary systems, and the calculated results are discussed.