Thermochemistry of ulexite

被引：0
|
作者：
Chen, RY
Li, J
Xia, SP
Gao, SY [1 ]
机构：
[1] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China
[2] Chinese Acad Sci, Inst Salt Lakes, Xian Branch, Xian 710043, Shaanxi Prov, Peoples R China
来源：
THERMOCHIMICA ACTA | 1997年 / 306卷 / 1-2期
关键词：
molar enthalpy of solution; solution calorimetry; standard molar enthalpy of formation; ulexite;
D O I：
暂无
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The enthalpy of solution of ulexite NaCa[B5O6(OH)(6)]5 . H2O in approximate to 1 mol dm(-3) aqueous hydrochloric acid has been measured. From this result and the enthalpies of solution of H(3)BO(0)3 in HCl(aq), of CaO in aqueous (hydrochloric acid + boric acid), and of NaCl in aqueous (hydrochloric acid + boric acid + calcium oxide), the standard molar enthalpy of formation of ulexite of -6762.24 +/- 4.22 kJ mol(-1) has been obtained. The standard molar entropy of formation of ulexite was calculated from the thermodynamic relation with the standard molar Gibbs free energy of formation of ulexite computed from its solubility in water. (C) 1997 Elsevier Science B.V.
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页码：1 / 5
页数：5
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