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CAS number: 7487-88-9, 14168-73-1 (monohydrate), 24378-31-2 (tetrahydrate), 15553-21-6 (pentahydrate), 13778-97-7 (hexahydrate), 10034-99-8 (heptahydrate)
PubChem: 24083
ChemSpider: 22515
DrugBank: DB00653
Chebi: 32599
RTECS number: OM4500000
ATC code: A06AD04, A12CC02 B05XA05 D11AX05 V04CC02
Molecular formula: MgSO4
Molar mass: 120.366 g / mol (anhydrous) 246.47 g / mol (heptahydrate)
Appearance: white crystalline solid
Odor: odorless
Density: 2.66 g / cm 3 (anhydrous) 2.445 g / cm 3 (monohydrate) 1.68 g / cm 3 (heptahydrate) 1.512 g / cm 3 (11-hydrate)
Melting point: 1124 ° C (anhydrous, decomp) 200 ° C (monohydrate, Decay) 150 ° C (heptahydrate, Decay) 2 ° C (11-hydrate, decomp)
Solubility in water: 26.9 g / 100 mL (0 ° C) 25.5 g / 100 ml (20 ° C) heptahydrate 71 g / 100 ml (20 ° C)

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General Information

The chemical formula of MgSO4 is colorless and contains a soluble water soluble magnesium oxide of 16% or more. It has a white and crystalline appearance. It is usually found in the form of British salt of sulphate mineral in the form of heptahydrate (MgSO4 · 7H2). It plays a role in the formation of carbohydrates, proteins, fats and vitamins. It is a substance found in sea water that can crystallize as a hydrate in the form of small needles.

Molecular Structure

Mg 2 SO4 -2

Production and Reactions
The hydrated compound (MgSO4-H2O), called kizerit, is found as a mineral in nature. The magnesium sulfate MgSO 4 -7H 2O is produced by Sun.

Usage areas

In this sector magnesium sulfate salt is used in the British salt crystallization processes.


It is used to remove the Mg deficiency of chlorophyll in plants.

Medical; It is used to prevent premature birth of magnesium sulphate.

It is used as a thickener in some of the detergents, especially in winter.

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