DICP OpenIR
Subject Area物理化学
THERMODYNAMIC STUDY OF HYDTATED SODIUM L-THREONATE, Na (C4H7O5)×H2O(s)
Di YY(邸友萤); Tan ZC(谭志诚); 高胜利等; Zhi-Cheng Tan
Conference Name18th IUPAC Conference on Chemical Thermodynamics and The 12th National Conference on Chemical Thermodynamics and Thermal Analysis
Conference Date2004-8-17
2004-08-17
Conference Place中国
Pages330/1
Department十五室
Funding Organization中国化学会
AbstractA novel compound, Na(C4H7O5)×H2O(s), was synthesized. The composition, structure and properties of the compound were determined by FTIR, TG/DTG, chemical and elementary analysis. Low-temperature heat capacities of the compound were measured with a precise automated adiabatic calorimeter in the temperature range of 78 ~ 390 K. One phase transition of solid-solid and a process of dehydration occurred in the temperature regions of 290~318 K and 367~373 K, respectively. The peak temperatures of the solid-solid transition and the dehydration of the compound were observed: Ttrans = (311.441  0.221) K and Td = (371.274  0.080) K, by the heat-capacity measurements. The molar enthalpy and entropy of the solid-solid transition of the substance were determined: (5.753  0.006) kJmol-1 and (18.473  0.016) JK-1mol-1. The molar enthalpy and entropy of dehydration of the substance were (15.353  0.027) kJmol-1 and (41.352  0.078) JK-1mol-1. The experimental values of molar heat capacities in solids (I, II and III) were respectively fitted to three polynomials by least square method. The constant volume energy of combustion of the compound were determined to be, - (1803.62  0.91) kJmol-1, by means of a RBC-II precision rotating-bomb combustion calorimeter at T = (298.15  0.001) K. The standard molar enthalpy of combustion of the compound was derived from its constant-volume energy of combustion to be, - (1802.38  0.91) kJmol-1. The standard molar enthalpy of formation of the compound has been calculated, [Na(C4H7O5)×H2O, s] = - (1265.84  1.06) kJmol-1, from the combination of the datum of standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities through a Hess thermochemical cycle.
Language中文
Document Type会议论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/111784
Collection中国科学院大连化学物理研究所
Corresponding AuthorZhi-Cheng Tan
Recommended Citation
GB/T 7714
Di YY,Tan ZC,高胜利等,et al. THERMODYNAMIC STUDY OF HYDTATED SODIUM L-THREONATE, Na (C4H7O5)×H2O(s)[C],2004:330/1.
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