W. L. Marshall, R. Slusher
Oct 1, 1975
Citations
0
Influential Citations
10
Citations
Journal
Journal of Inorganic and Nuclear Chemistry
Abstract
Abstract To broaden the types of salts studied in high temperature aqueous systems, solubilities of 3-2 samarium sulfate hydrates have been determined in water (25–350°C) and in aqueous sulfuric acid (150–250°C). The values in water for the octahydrate decrease from 0·033 m at 25°C to 8 × 10 −6 m for a lower hydrate at 350°C. Assumptions of several sets of ionic species saturating the sulfuric acid solutions have been tested by extended Debye-Huckel theory, which suggests that the 3-2 samarium sulfate may behave predominantly as a 2-2 sulfate at high temperatures, thus producing Sm 2 (SO 4 ) 2 2+ and SO 4 2− ions in solution. Similar treatment of Lietzke and Stoughton's solubilities of lanthanum sulfate in sulfuric acid at 135–160°C is not inconsistent with this suggestion. Based on behavior as a 2-2 salt, thermodynamic functions for the solubility of samarium sulfate hydrate at 150–250°C are presented, together with some comparisons from the solubilities of lanthanum sulfate hydrate.