物理化学学报 >> 1988, Vol. 4 >> Issue (02): 177-181.doi: 10.3866/PKU.WHXB19880212

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NaCl、KCl在CH3OH+DMF或DMSO混合溶剂中的溶解度, 278、288、298、303、313 K

李芝芬; 黄忆宁; 王蕾; 徐一慧; 刘瑞麟   

  1. 北京大学物理化学研究所
  • 收稿日期:1986-10-27 修回日期:1987-07-20 发布日期:1988-04-15
  • 通讯作者: 李芝芬

SOLUBILITIES OF NaCl AND KCl IN THE MIXED SOLVENTS OF CH3OH-DMF AND CH3OH-DMSO AT 278, 288, 298, 303 AND 313 K

Li Zhifen*; Huang Yining; Wang Lei; Xu Yihui; Liu Ruilin   

  1. Institute of Physical Chemistry; Peking University
  • Received:1986-10-27 Revised:1987-07-20 Published:1988-04-15
  • Contact: Li Zhifen

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摘要： 本工作测定了NaCl、KCl在CH_3OH与DMF及CH_3OH与DMSO全组成范围混合溶剂中的溶解度。实验温度分别是; 对NaCl:278、288、298、303、313 K, 对KCl:288、303、313 K。随着溶剂组成变化KCl和NaCl的溶解度曲线皆有一极大值。溶解度温度系数分别为正和负, 随着溶剂中CH_3OH组份的减少温度系数减小。根据实验结果, 计算得NaCl和KCl自甲醇至混合溶剂的转移自由能和熵。对离子在此混合物中的溶剂化、结构影响和盐的溶解倾向作了初步解释。

Abstract: Solubilities of KCl and NaCl in binary mixed solvents of CH_3OH-DMF and CH_3OH-DMSO with mole fraction of components from 0 to 1 were measured at 288, 303, 313 K for KCl and 278, 288, 298, 303 and 313 K for NaCl. A plot of solubility of KCl and NaCl vs composition of solvent shows a maximum. The coefficient of solubility with temperature for KCl is positive and for NaCl is negative. The transfer free energy and entropy of KCl and NaCl from pure methanol to mixed solvents were evaluated from the measurements, thus the structure property of solution, the effect of salt on it, the ionic solvation and the tendentiousness of solution were discussed preliminarily.