Low-Temperature Heat Capacities and Thermodynamic Properties of Aqueous Na2B4O7 Solution

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	Low-Temperature Heat Capacities and Thermodynamic Properties of Aqueous Na2B4O7 Solution
	Meng Qing-Fen3 ; Tan Zhi-Cheng 1,2; Dong Ya-Ping3 ; Feng Hai-Tao3 ; Li Wu3
	2010-08-10
发表期刊	CHINESE JOURNAL OF INORGANIC CHEMISTRY
卷号	26 期号:8 页码:1333-1338
关键词	Aqueous Na2b4o7 Solution Low-temperature Heat Capacity Thermodynamic Function Adiabatic Calorimetry
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.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5955
专题	青海盐湖研究所知识仓储盐湖资源综合利用工程技术中心
作者单位	1.Chinese Acad Sci, China Ion Liquid Lab, Dalian 116023, Liaoning, Peoples R China 2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Liaoning, Peoples R China 3.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
推荐引用方式 GB/T 7714	Meng Qing-Fen,Tan Zhi-Cheng,Dong Ya-Ping,et al. Low-Temperature Heat Capacities and Thermodynamic Properties of Aqueous Na2B4O7 Solution[J]. CHINESE JOURNAL OF INORGANIC CHEMISTRY,2010,26(8):1333-1338.
APA	Meng Qing-Fen,Tan Zhi-Cheng,Dong Ya-Ping,Feng Hai-Tao,&Li Wu.(2010).Low-Temperature Heat Capacities and Thermodynamic Properties of Aqueous Na2B4O7 Solution.CHINESE JOURNAL OF INORGANIC CHEMISTRY,26(8),1333-1338.
MLA	Meng Qing-Fen,et al."Low-Temperature Heat Capacities and Thermodynamic Properties of Aqueous Na2B4O7 Solution".CHINESE JOURNAL OF INORGANIC CHEMISTRY 26.8(2010):1333-1338.