在25, 35和45 ℃下, 测定了LaCl3在纯水及低于30%的盐酸中的溶解度, 盐酸的浓度范围为0～9.583 mol·L-1. HCl的含量用NaOH滴定, 用甲基橙作指示剂, Cl-的总浓度用AgNO3滴定, 以K2CrO4为指示剂, 滴定时溶液的pH值为4～6, LaCl3的含量通过总的Cl- 含量和H+ 量的差值计算而得. 采用湿固相法构建了上述温度下的LaCl3-HCl-H2O体系的部分相图. 相图表明, 在上述各温度下从LaCl3饱和溶液中析出的固相组成均为LaCl3·7H2O.
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