| 中图分类号：O642.3 文献标识码：A 文章编号： |
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| 引用本文： | 肖举,袁菲,李珑,郭亚飞,王士强,邓天龙.中图分类号：O642.3 文献标识码：A 文章编号：[J].盐湖研究,2021,29(1). |
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| 作者姓名： | 肖举 袁菲 李珑 郭亚飞 王士强 邓天龙 |
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| 作者单位： | 天津科技大学,天津科技大学,天津科技大学,天津科技大学,天津科技大学,天津科技大学 |
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| 基金项目： | 国家自然科学基金(No.U21A20299、22103056)和教育部创新团队发展计划项目(IRT_17R81)。 |
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| 摘 要： | 不同形态硼酸盐焓、熵、吉布斯自由能等热力学参数极为缺乏,其准确测定对丰富和发展盐湖硼酸盐化学理论至关重要。本文采用TAM IV微量热计测定了五水合五硼酸钠(NaB5O8.5H2O)溶解热。根据设计的热化学循环,结合Pitzer电解质模型和热力学基本公式,首次获得了NaB5O8.5H2O在298.15 K下标准生成焓(, -5189.4820 kJ×mol-1)、标准生成熵(, 4380.4771 kJ×mol-1)、标准生成吉布斯自由能(, 4380.4771 kJ×mol-1)等热力学参数。这些尚未见报道的热力学参数对丰富无机盐热力学数据和促进盐湖资源综合利用具有重要的科学价值。
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| 关 键 词： | 溶解焓 硼酸钠 标准生成焓 标准生成熵 标准吉布斯自由能 |
| 收稿时间： | 2022/1/19 0:00:00 |
| 修稿时间： | 2022/1/24 0:00:00 |
Dissolution Enthalpy and Thermodynamic Properties of NaB5O8.5H2O |
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| xiaoju,yuanfei,lilong,guoyafei,wangshiqiang and dengtianlong.Dissolution Enthalpy and Thermodynamic Properties of NaB5O8.5H2O[J].Journal of Salt Lake Research,2021,29(1). |
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| Authors: | xiaoju yuanfei lilong guoyafei wangshiqiang and dengtianlong |
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| Institution: | Tianjin University of Science and Technology,Tianjin University of Science and Technology,Tianjin University of Science and Technology,Tianjin University of Science and Technology,Tianjin University of Science and Technology,Tianjin University of Science and Technology |
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| Abstract: | Thermodynamic parameters of different borates, such as the dissolution enthalpy (DHs), the standard enthalpy of formation (), the standard entropy of formation () and the standard Gibbs free energy () are essential to enrich and develop the boron chemistry theory of salt lakes. In this paper, the dissolution enthalpy (DHs) of sodium pentaborate pentahydrate (NaB5O8.5H2O) was measured using microcalorimeter TAM IV. Based on these, the standard enthalpy of formation (), the standard entropy of forma1tion () and the standard Gibbs free energy () of NaB5O8.5H2O were calculated precisely. And the values of, and are -5189.4820 kJ×mol-1, -32.0978 kJ×mol-1.K-1, 4380.4771 kJ×mol-1 for NaB5O8.5H2O, respectively. None of these data has been reported in the literature, which is valuable to enriching the thermodynamic data of inorganic substances and utilizing the salt lake resources. |
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| Keywords: | Dissolution enthalpies Sodium borates Standard enthalpy of formation Standard entropy of formation Standard Gibbs free energy |
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