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K2O·MgO·6B2O3·10H2O的热化学研究(英文)

Thermochemistry of Dipotassium Magnesium Dodecaborate Decahydrate

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【作者】 蔡曙光李军李冰

【Author】 CAI Shu-guang, LI Jun, LI Bing (Xi’an Branch, Qinghai Institute of Salt Lakes, The Chinese Academy of Sciences, Xi’an 710043, P. R. China)

【机构】 中国科学院青海盐湖研究所西安二部中国科学院青海盐湖研究所西安二部 陕西西安710043陕西西安710043陕西西安710043

【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。

【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.

  • 【文献出处】 盐湖研究 ,Journal of Salt Lake Research , 编辑部邮箱 ,2001年04期
  • 【分类号】O642.3
  • 【下载频次】28
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