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题名: Low-temperature heat capacity and standard molar enthalpy of formation of potassium L-threonate hydrate K(C4H7O5)center dot H2O
作者: Wei, Q;  Chen, SP;  Gao, SL;  Di, YY;  Tan, ZC;  Shi, QZ
关键词: potassium L-threonate hydrate ;  low-temperature heat capacity ;  adiabatic calorimetry ;  rotary-bomb combustion calorimetry ;  standard molar enthalpy of formation
刊名: CHINESE JOURNAL OF CHEMISTRY
发表日期: 2006-02-01
卷: 24, 期:2, 页:187-192
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: The solid potassium L-threonate hydrate, K(C4H7O5)(H2O)-H-., was synthesized by the reaction of L-threonic acid with aqueous potassium hydrogen carbonate and characterized by means of chemical and elemental analyses, IR and TG-DTG. Low-temperature heat capacity of K(C4H7O5)(H2O)-H-. has been precisely measured with a small sample precise automated adiabatic calorimeter over the temperature range from 78 to 395 K. An obvious process of the dehydration occurred in the temperature region of 364-382 K. The peak temperature of the dehydration of the compound has been observed to be (380.524 +/- 0.093) K by means of the heat capacity measurements. The molar enthalpy, Delta(d)H(m), and molar entropy, Delta(d)S(m), of the dehydration of K(C4H7O5)(H2O)-H-. were calculated to be (19.655 +/- 0.012) kJ/mol and (51.618 +/- 0.051) J/(K-mol) by the analysis of the heat-capacity curve. The experimental molar heat capacities of the solid from 78 to 362 K and from 382 to 395 K have been respectively fitted to two polynomial equations of heat capacities against the reduced temperatures by least square method. The constant-volume energy of combustion of the compound, Delta(c)U(m), has been determined to be (-1749.71 +/- 0.91) kJ(.)mol(-1) by an RBC-II precision rotary-bomb combustion calorimeter at 298.15 K. The standard molar enthalpy of formation of the compound, Delta(f)H(m)(theta) has been calculated to be (- 1292.56 +/- 1.06) kJ(.)mol(-1) from the combination of the standard molar enthalpy of combustion of the compound with other auxiliary thermodynamic quantities.
关键词[WOS]: THERMODYNAMIC PROPERTIES ;  ACID ;  CALORIMETER
语种: 英语
WOS记录号: WOS:000235202400006
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140001
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.NW Univ Xian, Dept Chem, Xian 710069, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, ThermoChem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Wei, Q,Chen, SP,Gao, SL,et al. Low-temperature heat capacity and standard molar enthalpy of formation of potassium L-threonate hydrate K(C4H7O5)center dot H2O[J]. CHINESE JOURNAL OF CHEMISTRY,2006,24(2):187-192.
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