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Low-Temperature Heat Capacities and Thermodynamic Properties of Aqueous Na2B4O7 Solution
Meng Qing-Fen3; Tan Zhi-Cheng1,2; Dong Ya-Ping3; Feng Hai-Tao3; Li Wu3
2010-08-10
Source PublicationCHINESE JOURNAL OF INORGANIC CHEMISTRY
Volume26Issue:8Pages:1333-1338
SubtypeArticle
AbstractThe 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.
KeywordAqueous Na2b4o7 Solution Low-temperature Heat Capacity Thermodynamic Function Adiabatic Calorimetry
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordCALORIMETER ; RANGE ; NACL
Indexed BySCI
Language英语
WOS Research AreaChemistry
WOS SubjectChemistry, Inorganic & Nuclear
WOS IDWOS:000281180800002
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Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/5955
Collection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
Affiliation1.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
Recommended Citation
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.
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