Thermochemistry of hydrated potassium and sodium borates

被引：48

作者：

Li, J ^{[1
]}

Li, B ^{[1
]}

Gao, SY ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Salt Lakes, Xian Branch, Xian, Peoples R China

来源：

JOURNAL OF CHEMICAL THERMODYNAMICS | 1998年 / 30卷 / 04期

关键词：

hydrated potassium borates; hydrated sodium borates; standard molar enthalpy of formation; solution calorimetry; molar enthalpy of solution;

D O I：

10.1006/jcht.1997.0304

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The enthalpies of solution of the hydrated potassium and sodium berates K2B4O7 . 4H(2)O, KB5OB8 . 4H(2)O, and NaB5O8 . 5H(2)O in approximately 1 mol.dm(-3) aqueous hydrochloric acid, as well as the enthalpies of solution of H3BO3 in HCl(aq) and of KCl and NaCl in (hydrochloric acid + boric acid) (aq) were determined. Together with the standard molar enthalpies of formation of KCl(s), NaCl(s), H3BO3(s), and H2O(1), the standard molar enthalpies of formation of -(4568.77 +/- 3.24)kJ.mol(-1), -(4834.19 +/- 4.03)kJ.mol(-1), and -(5099.77 +/- 4.03)kJ.mol(-1) for K2B4O7 . 4H(2)O, KB5O8 . 4H(2)O, and NaB5O8 . 5H(2)O were obtained. (C) 1998 Academic Press Limited.

引用

页码：425 / 430

页数：6

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