Solubility and thermodynamic functions for a 3–2 salt, samarium sulfate, in water and sulfuric acid solutions at temperatures to 350°C☆

Add time:08/31/2019    Source:sciencedirect.com

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-Hückel theory, which suggests that the 3-2 samarium sulfate may behave predominantly as a 2-2 sulfate at high temperatures, thus producing Sm2(SO4)22+ and SO42− 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.

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