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题名: Low-temperature heat capacities and thermochemistry of sodium nicotinate Na(C6H4NO2)(s)
作者: Yang Wei-Wei1;  Kong Yu-Xia1;  Di You-Ying1;  Shi Quan2;  Tan Zhi-Cheng2
关键词: sodium nicotinate ;  adiabatic calorimetry ;  low-temperature heat capacity ;  solution-reaction calorimetry ;  standard molar enthalpy of formation
刊名: CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
发表日期: 2008-04-10
卷: 29, 期:4, 页:799-804
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Nicotinic acid and sodium acetate were chosen as the reactants, a compound - sodium nicotinate was synthesized by the method of room temperature solid phase synthesis. FTIR and X-ray powder diffraction technique were applied to characterize its structure, and its composition was determined to be Na ( C6H4NO2) by chemical and elemental analyses. Low-temperature heat capacities of the compound were measured by a precision automated adiabatic calorimeter over the temperature range from 78 K to 400 K. A polynomial equation of the heat capacities as a function of the temperature was fitted by the least square method. On the basis of the fitted polynomial, the smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated at the interval of 5 K. A reasonable thermochemical cycle was designed on the basis of the solid phase preparation reaction of the substance, 1 mol/L NaOH solution was chosen as the calorimetric solvent, and the standard molar enthalpies of dissolution for the reactants and products of the solid phase reaction in the selected solvents were measured by an isoperibol solution-reaction calorimeter, respectively. In addition, the enthalpy change of the solid phase reaction was determined to be (23.232 +/- 0.509) kJ/mol from the data of the above standard molar enthalpies of dissolution. Eventually, the standard molar enthalpy of formation of sodium nicotinate was derived to be: Delta H-f(m)0. [ Na ( C6H4NO2), s ] = (-548. 96 +/- 1.11) kJ/mol, by the combination of the enthalpy change of the solid phase reaction with other auxiliary thermodynamic quantities.
关键词[WOS]: THERMODYNAMIC PROPERTIES ;  ENTHALPIES
语种: 英语
WOS记录号: WOS:000255101400030
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140871
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252059, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Yang Wei-Wei,Kong Yu-Xia,Di You-Ying,et al. Low-temperature heat capacities and thermochemistry of sodium nicotinate Na(C6H4NO2)(s)[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2008,29(4):799-804.
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