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Magnesium Sulfate

General Information:


CAS Number: 7487-88-9 (anhydrous)

Molecular Weight: 120.37 g/mol (anhydrous)

Appearance: White solid

Chemical Formula: MgSO4

Anhydrous magnesium sulfate (MgSO4) is commonly used as a drying agent in organic chemistry. It is typically used to dry the organic layer after an aqueous work-up. Anhydrous magnesium sulfate is added to the wet organic layer and the resulting solid magnesium sulfate hydrate is simply removed by filtration, providing a dry (anhydrous) organic filtrate. Anhydrous sodium sulfate (Na2SO4) is the other drying agent that is commonly used for similar purposes.

Common Uses:

Drying agent for organic solvents (removes H2O)

Procedure excerpt:

…The org layer was washed with H2O, brine, dried (MgSO4), and concentrated in vacuo to provide the product as a pale yellow oil…


1) WO2015129926, page 93

2) Wikipedia: Magnesium sulfate (link)

3) Magnesium sulfate (link)