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题名: Study on thermochemistry of hydrated potassium monoborate
作者: Zhu, LX ;  Gao, SY ;  Wang, B ;  Xia, SP
刊名: CHINESE JOURNAL OF INORGANIC CHEMISTRY
出版日期: 2003
卷号: 19, 期号:3, 页码:333-336
英文摘要: Hydrated potassium monoborate (KBO2 . 4/3H(2)O) was obtained from an aqueous solution in a mole ratio of K2O: B2O3 = 2: 1 and characterized by powder X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and Raman spectroscopy. The enthalpy of solution of hydrated potassium monoborate, KBO2 . 4/3H(2)O, in approximately 1mol . dm(-3) aqueous hydrochloric acid was determined. Together with the previously determined enthalpies of solution of H3BO3 in approximately 1mol . dm(-3) HCl (aq) and of KCl in aqueous (hydrochloric acid + boric acid), the standard molar enthalpy of formation of - ( 1411.11 +/- 0. 84) kJ . mol(-1) for KBO2 . 4/3H(2)O was obtained from the standard molar enthalpies of formation of KCl(s), H3BO3(S), and H2O(l). The standard molar entropy of formation of - 422. 94J . K-1 . mol(-1) and standard molar entropy of 163. 47J . K-1 mol (-1) for KBO2 . 4/3H(2)O were calculated from the thermodynamic relations. A group contribution method is applicable to KBO2 . 4/3H(2)O. Hydrated potassium monoborate (KBO2 . 4/3H(2)O) was obtained from an aqueous solution in a mole ratio of K2O: B2O3 = 2: 1 and characterized by powder X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and Raman spectroscopy. The enthalpy of solution of hydrated potassium monoborate, KBO2 . 4/3H(2)O, in approximately 1mol . dm(-3) aqueous hydrochloric acid was determined. Together with the previously determined enthalpies of solution of H3BO3 in approximately 1mol . dm(-3) HCl (aq) and of KCl in aqueous (hydrochloric acid + boric acid), the standard molar enthalpy of formation of - ( 1411.11 +/- 0. 84) kJ . mol(-1) for KBO2 . 4/3H(2)O was obtained from the standard molar enthalpies of formation of KCl(s), H3BO3(S), and H2O(l). The standard molar entropy of formation of - 422. 94J . K-1 . mol(-1) and standard molar entropy of 163. 47J . K-1 mol (-1) for KBO2 . 4/3H(2)O were calculated from the thermodynamic relations. A group contribution method is applicable to KBO2 . 4/3H(2)O.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.isl.ac.cn/handle/363002/2354
Appears in Collections:青海盐湖研究所知识仓储(2014年之前)_期刊论文

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Recommended Citation:
Zhu, LX,Gao, SY,Wang, B,et al. Study on thermochemistry of hydrated potassium monoborate[J]. CHINESE JOURNAL OF INORGANIC CHEMISTRY,2003,19(3):333-336.
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