Magnesium Sulfate, Anhydrous
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This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition
Issued and maintained by the United States Pharmacopeial Convention (USP)
MgSO4 120.37 CAS RN®: 7487-88-9.—Anhydrous Magnesium sulfate may be prepared as follows. Place a suitable quantity of magnesium sulfate (see above), preferably powdered, in a shallow vessel, and expose to a temperature of about 80° for several hours with occasional stirring. Then heat at 275° to 300° until the weight is practically constant. Transfer the product while still warm to tight containers, as the anhydrous salt is very hygroscopic.
