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题名: Low-Temperature Heat Capacities and Thermodynamic Properties of AqueousNa2B4O7 Solution
作者: 孟庆芬 ;  Tan Zhi-Cheng ;  董亚萍 ;  冯海涛 ;  李武
刊名: CHINESE JOURNAL OF INORGANIC CHEMISTRY
出版日期: 2010
卷号: 26, 期号:8, 页码:1333-1338
英文摘要: The molar heat capacities of aqueous Na2B4O7 solution with concentration of 0.033 55 mol . kg(-1) were measured by a precision automated adiabatic calorimeter in the temperature range from 78 K to 351 K. The fusion transition at T=272.905 K was observed from the heat capacity measurements. According to the polynomial equations of heat capacity as a function of temperature and thermodynamic relationship, the thermodynamic functions (H-r-H-298.15K) and (S-r-S-298.15 (K)) of the aqueous borax decahydrate solution were derived in the temperature range from about 80 to 350 K with an interval of 5 K. The molar enthalpy and entropy of the phase transition were determined to be 4.536 kJ . mol(-1) and 16.62 J . K-1 . mol(-1). The activity of the solution was determined to be 0.997 63 by using the freezing point depression of the solution based on the liquid-solid phase equilibrium rule. The molar heat capacities of aqueous Na2B4O7 solution with concentration of 0.033 55 mol . kg(-1) were measured by a precision automated adiabatic calorimeter in the temperature range from 78 K to 351 K. The fusion transition at T=272.905 K was observed from the heat capacity measurements. According to the polynomial equations of heat capacity as a function of temperature and thermodynamic relationship, the thermodynamic functions (H-r-H-298.15K) and (S-r-S-298.15 (K)) of the aqueous borax decahydrate solution were derived in the temperature range from about 80 to 350 K with an interval of 5 K. The molar enthalpy and entropy of the phase transition were determined to be 4.536 kJ . mol(-1) and 16.62 J . K-1 . mol(-1). The activity of the solution was determined to be 0.997 63 by using the freezing point depression of the solution based on the liquid-solid phase equilibrium rule.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.isl.ac.cn/handle/363002/1906
Appears in Collections:青海盐湖研究所知识仓储(2014年之前)_期刊论文

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Recommended Citation:
Meng Qing-Fen,Tan Zhi-Cheng,Dong Ya-Ping,et al. Low-Temperature Heat Capacities and Thermodynamic Properties of AqueousNa2B4O7 Solution[J]. CHINESE JOURNAL OF INORGANIC CHEMISTRY,2010,26(8):1333-1338.
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