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13142

Sigma-Aldrich

Magnesium sulfate heptahydrate

99.5-100.5% (calc. to the dried substance), meets analytical specification of Ph. Eur., BP,USP, FCC

Synonym(s):
Epsom salts
Linear Formula:
MgSO4 · 7H2O
CAS Number:
Molecular Weight:
246.47
EC Number:
MDL number:
eCl@ss:
38030409
PubChem Substance ID:
NACRES:
NA.21

Quality Level

vapor density

<0.01 (vs air)

vapor pressure

<0.1 mmHg ( 20 °C)

assay

99.5-100.5% (calc. to the dried substance)

form

powder or crystals

quality

meets analytical specification of Ph. Eur., BP,USP, FCC

impurities

acidity or alkalinity, in accordance
organic volatile impurities, complies (GC)
residual solvents, complies
≤0.001 ppm heavy metals (as Pb)
≤0.004% free alkali (as MgO)
≤0.01% free acid (as H2SO4)

loss

48.0-52.0% loss on drying, 450 °C

pH

5.0-9.2 (25 °C, 5%)

anion traces

chloride (Cl-): ≤150 mg/kg

cation traces

As: ≤2 ppm
Fe: ≤20 ppm
Pb: ≤4 ppm
Se: ≤30 ppm

suitability

complies for appearance of solution

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 is the hydrated salt of magnesium. The spin-Hamiltonian parameters of the (Cu(H2O)6)2+ complex in magnesium sulfate heptahydrate have been determined by electron spin resonance (ESR) spectral studies. Raman spectra of 10 hydrated and anhydrous forms of magnesium sulfates have been reported. Their crystal structure and space groups have been evaluated by Raman and XRD (X-ray diffraction) studies.

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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