Chem. J. Chinese Universities ›› 1982, Vol. 3 ›› Issue (4): 447.

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A STUDY ON TERNARY SYSTEM LaCl3-THIOUREA-H2O AT 30℃ AND AT 50℃

Tang Zongxun, Guo Zhizhen, Chen Peihang, Ma Jinhua, Chen Yunsheng   

  1. Department of Chemistry, Northwestern University, Xian
  • Received:1981-04-09 Online:1982-12-24 Published:1982-12-24

Abstract: By using the heptahydrate and trihydrate of lathanum trichloride as starting materials, the solubilities and the refractive indices of the saturated solutions in the ternary system LaCl3-CS(NH2)2-H2O have been investigated. The isotherms of solubilities and refractive indices of the system at both 30℃ and 50℃ consist of 2 branches, one corresponding to the saturated solution of LaCl3·7H2O and the other to CS(NH3)2. The solubility data obtained are: LaCl3 - 49.32% and CS(NH2)3 -16.83% at 30℃ and 51.72% and 32.46% at 50° in pure water, respectively. The compositions of the double saturated solutions are: LaCl3 - 46.72%, CS(NH2)2-6.15% at 30℃ and 48.05% and 8.98% at 50℃, respectively.The presence of solid phase, hexahydrated LaCl3 reported by Z. M. Zholalieva et al, in 1978 was not found.

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