Abstract
Solubilities of the quaternary system RbCl−LaCl3−HCl−H2O were determined at 298.15 K, and the corresponding equilibrium diagram was constructed in this paper. There are three equilibrium solid phases, RbCl, RbLaCl4·4H2O (1:1 type), and LaCl3·7H2O in the quaternary system. The new compound RbLaCl4·4H2O was found to be congruently soluble in the system. The compound RbLaCl4·4H2O was characterized by the methods of X-ray diffraction, thermogravimetry, and differential thermogravimetry. The compound loses its crystal water by one step at (358 to 449) K. The standard molar enthalpy of solution of RbLaCl4·4H2O in deionized water was measured to be (−19.61 ± 0.24) kJ·mol−1 by heat conduction microcalorimetry. Its standard molar enthalpy of formation was calculated to be (−2750.4 ± 1.1) kJ·mol−1.
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