Synthesis, characterization, and thermodynamic study of ammonium benzoate C7H5O2NH4(s)

被引：8

作者：

Yang, Wei-Wei ^{[1
]}

Di, You-Ying ^{[1
]}

Kong, Yu-Xia ^{[1
]}

Guo, Xiao-Yang ^{[1
]}

Tan, Zhi-Cheng ^{[2
]}

机构：

[1] Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252059, Shandong, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

来源：

THERMOCHIMICA ACTA | 2010年 / 502卷 / 1-2期

关键词：

C7H5O2NH4(s); Adiabatic calorimeter; Low-temperature heat capacity; Isoperibol solution-reaction calorimeter; Standard molar enthalpy of formation; ACIDS; HEAT;

D O I：

10.1016/j.tca.2010.01.021

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Benzoic acid and concentrated ammonia were chosen as reactants and a novel compound (ammonium benzoate) was synthesized using the method of liquid phase reaction. FTIR, elemental analysis and X-ray powder diffraction technique were applied to characterize the structure and composition of the compound. Low-temperature heat capacities of the solid compound were measured by a precision automated adiabatic calorimeter over the temperature range from 80 to 399K. A polynomial equation of the heat capacities was fitted by the least-squares method. In accordance with Hess' law, a thermochemical cycle was designed, the enthalpy change of the reaction of benzoic acid with ammonium acetate was determined as Delta H-r(m)degrees = (15.59 +/- 0.50) kJ mol(-1), and the standard molar enthalpy of formation of the compound was calculated as Delta H-f(m)degrees [C7H5O2NH4,S] = -(472.65 +/- 0.62) kJ mol(-1) by an isoperibol solution-reaction calorimeter. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：14 / 19

页数：6

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