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Low-temperature heat capacities and thermochemistry of sodium nicotinate Na(C6H4NO2)(s)
Yang Wei-Wei1; Kong Yu-Xia1; Di You-Ying1; Shi Quan2; Tan Zhi-Cheng2
KeywordSodium Nicotinate Adiabatic Calorimetry Low-temperature Heat Capacity Solution-reaction Calorimetry Standard Molar Enthalpy Of Formation
Source PublicationCHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
2008-04-10
Volume29Issue:4Pages:799-804
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences
WOS SubjectChemistry, Multidisciplinary
WOS Research AreaChemistry
WOS KeywordTHERMODYNAMIC PROPERTIES ; ENTHALPIES
AbstractNicotinic 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.
Language英语
WOS IDWOS:000255101400030
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140871
Collection中国科学院大连化学物理研究所
Affiliation1.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
GB/T 7714
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.
APA Yang Wei-Wei,Kong Yu-Xia,Di You-Ying,Shi Quan,&Tan Zhi-Cheng.(2008).Low-temperature heat capacities and thermochemistry of sodium nicotinate Na(C6H4NO2)(s).CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,29(4),799-804.
MLA Yang Wei-Wei,et al."Low-temperature heat capacities and thermochemistry of sodium nicotinate Na(C6H4NO2)(s)".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 29.4(2008):799-804.
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