Low-Temperature Heat Capacities and Thermodynamic Properties of AqueousNa2B4O7 Solution

ISL OpenIR > 青海盐湖研究所知识仓储

	Low-Temperature Heat Capacities and Thermodynamic Properties of AqueousNa2B4O7 Solution
	Meng Qing-Fen; Tan Zhi-Cheng; Dong Ya-Ping; Feng Hai-Tao; Li Wu
	2010
发表期刊	CHINESE JOURNAL OF INORGANIC CHEMISTRY
ISSN	1001-4861
卷号	26 期号:8 页码:1333-1338
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.
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/1906
专题	青海盐湖研究所知识仓储
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 AqueousNa2B4O7 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 AqueousNa2B4O7 Solution.CHINESE JOURNAL OF INORGANIC CHEMISTRY,26(8),1333-1338.
MLA	Meng Qing-Fen,et al."Low-Temperature Heat Capacities and Thermodynamic Properties of AqueousNa2B4O7 Solution".CHINESE JOURNAL OF INORGANIC CHEMISTRY 26.8(2010):1333-1338.