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Sigma-Aldrich

Magnesium sulfate heptahydrate

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≥99.9% trace metals basis

Synonym(s):

Epsom salt, Magnesium sulphate heptahydrate, Magnesium(II) sulfate heptahydrate, Epsom salts

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About This Item

Linear Formula:
MgSO4 · 7H2O
CAS Number:
Molecular Weight:
246.47
MDL number:
UNSPSC Code:
12141502

vapor density

<0.01 (vs air)

Quality Level

vapor pressure

<0.1 mmHg ( 20 °C)

type

(High purity Salts)

Assay

≥98% (EDTA titration)
≥99.9% trace metals basis

form

powder or crystals

color

white to off-white

solubility

water: soluble

anion traces

chloride (Cl-): ≤20 ppm
nitrate (NO3-): ≤50 ppm

cation traces

Al: ≤10 ppm
Ca: ≤10 ppm
Cd: ≤10 ppm
Cr: ≤10 ppm
Fe: ≤10 ppm
K: ≤10 ppm
Na: ≤30 ppm
Ni: ≤10 ppm
Pb: ≤10 ppm
Si: ≤10 ppm
Zn: ≤10 ppm

storage temp.

room temp

SMILES string

O.O.O.O.O.O.O.[Mg++].[O-]S([O-])(=O)=O

InChI

1S/Mg.H2O4S.7H2O/c;1-5(2,3)4;;;;;;;/h;(H2,1,2,3,4);7*1H2/q+2;;;;;;;;/p-2

InChI key

WRUGWIBCXHJTDG-UHFFFAOYSA-L

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General description

Magnesium Sulfate heptahydrate, commonly known as Epsom salt, is a white crystalline solid. It is highly soluble in water, forming a solution that is commonly used in various applications such as bath salts, fertilizers, and as a component in certain medical treatments. However, it is insoluble in ethanol. It is the source of Magnesium and sulfur.

Application

Magnesium Sulfate heptahydrate is found as a salt of high energy storage and sorption capacity. It was embedded in the polymeric matrix to form a foam for energy storage which prevents issue of swelling, agglomeration, and/or deliquescence of the salt during its de/hydration process. [,] Researchers are developing new adsorbents for removing toxic dyes from wastewater using Magnesium Sulfate heptahydrate. It is essential for creating porous MgAl-layered double hydroxide (LDH)/carbon fiber composites and MgFe2O4/γ-Fe2O3 magnetic microspheres. These composites effectively adsorb Congo red dye through a combination of biotemplating and pollen template.[,]

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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MgSO4?7H2O filled macro cellular foams: An innovative composite sorbent for thermo-chemical energy storage applications for solar buildings Author links open overlay panel
Brancato V, et al.
Solar Energy, 173 , 1278-1286 (2018)
Biotemplated Fabrication of 3D Hierarchically Porous MgAl-LDH/CF Composites with Effective Adsorption of Organic Dyes from Wastewater
Sun Q, et al.
Industrial & Engineering Chemistry Research, 59(38), 16838?16850-16838?16850 (2020)
Water Transport in MgSO4?7H2O During Dehydration in View of Thermal Storage
P. A. J. Donkers, et al.
The Journal of Physical Chemistry C, 119 (2015)
A hierarchically porous MgFe2O4/?-Fe2O3 magnetic microspheres for efficient removals of dye and pharmaceutical from water
Lu L, et al.
Chemical Engineering Journal, 283, 524-534 (2016)

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