高等学校化学学报

高等学校化学学报 ›› 1984, Vol. 5 ›› Issue (5): 599.

• 论文 • 上一篇    下一篇

硝酸镧水合物和无水硝酸镧在水内及一水硝酸镧在醇内溶解热的测定

过玮, 宋迪生, 刘翊纶   

  1. 西北大学
  • 收稿日期:1983-04-08 出版日期:1984-10-24 发布日期:1984-10-24

The Measurements of Solution Heat for La(NO3)5·nH2O in Water and La(NO3)5·H2O in Alcohols

Guo Wei, Song Disheng, Liu Yilun   

  1. Department of chemistry, Northwest University, Xi'an
  • Received:1983-04-08 Online:1984-10-24 Published:1984-10-24

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摘要： 本文测定了六水、四水、一水和无水硝酸镧在水中的溶解热和一水硝酸镧在甲醇、乙醇和正丙醇中的溶解热,求得了各种水合硝酸镧和无水硝酸镧的标准生成热、晶格能和相应的标准脱水焓。

Abstract: The solution heats of La(NO3)5 ·nH2O (where n = 6,4,1,0) in water were measured calorimetrically at 25℃. Their values are 5.448 ±0.006, 1.415 ±0.004, -13.301 ±0.005 and - 20.330 ± 0.070 Kcal/mol, respectively. The standard formation heats of these compounds, and their enthalpies of dehydration and lattice energies were calculated. The solution heats. of La(NO3)5H2O in methanol, ethanol and n-pro,pyl alcohol were, measured calorimetrically at 25℃. Their values are - 19.086 ± 0.021, -14.362 ±0.054 and - 11.755±0.054 Kcal/mol,respectively.

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