| K2O·MgO·6B2O3·10H2O的热化学研究 |
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| 引用本文： | 蔡曙光,李军,李冰.K2O·MgO·6B2O3·10H2O的热化学研究[J].盐湖研究,2001,9(4):41-47. |
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| 作者姓名： | 蔡曙光 李军 李冰 |
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| 作者单位： | 中国科学院青海盐湖研究所西安二部,陕西西西,710043 |
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| 摘 要： | 在大约１ｍｏｌ·ｄｍ－３的盐酸水溶液中测定了Ｋ２Ｏ·ＭｇＯ·６Ｂ２Ｏ３·１０Ｈ２Ｏ的溶解焓。结合已获得的其它热化学数据，得出Ｋ２Ｏ·ＭｇＯ·６Ｂ２Ｏ３·１０Ｈ２Ｏ的标准摩尔生成焓为－（１２２５０．３５±９．６８）ｋＪ·ｍｏｌ－１，并利用“基团贡献法”计算出标准摩尔吉布斯自由能为－１１１０３ｋＪ·ｍｏｌ－１。从而计算出其标准摩尔生成熵和标准摩尔熵。
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| 关 键 词： | K2O·MgO·6B2O3·10H2O 标准摩尔生成焓 溶液量热法 摩尔溶解焓 盐酸水溶液 |
| 文章编号： | 1008-858(2001)04-0041-07 |
| 修稿时间： | 2001年4月23日 |
Thermochemistry of Dipotassium Magnesium Dodecaborate Decahydrate |
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| CAI Shu-guang,LI Jun,LI Bing.Thermochemistry of Dipotassium Magnesium Dodecaborate Decahydrate[J].Journal of Salt Lake Research,2001,9(4):41-47. |
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| Authors: | CAI Shu-guang LI Jun LI Bing |
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| Abstract: | The enthalpies of solution of K2O·MgO·6B2O3·10H2O in approximately 1mol·dm-3 aqueous hydrochloric acid,and of KCI in aqueous（hydrochloric acid +boric acid +magnesium oxide )were determined. Together with the previously determined enthal- pies of solution of H3BO3 in approximately 1 mol· dm-3HCI（aq), and of MgO in aqueous (hydrochloric acid+boric acid ),the standard molar enthalpy of formation of-（12250. 35± 9. 68)kJ· mol-1 for K2O· MgO· 6B2O3· 10H2O was obtained from the standard molar en- thalpies of formation of MgO（s), H2BO3(s), KCI（s), and H2O（1). The standard molar en- tropy of formation of-3848. 23J. K-1· mol-1 and standard molar entropy of 765. 96 J· K-1· mol-1 for K2O· MgO· 6B2O3· 10H2O were calculated from the thermodynamic relations. |
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| Keywords: | Dipotassium magnesium dodecaborate decahydrate Standard molar enthalpy of formation Solution calorimetry Molar enthalpy of solution Aqueous hydrochloric acid solution |
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