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Magnesium Hydroxide
PRICE INQUIRYCatalog Number
ACM1309428-1
Product Name
Magnesium Hydroxide
CAS
1309-42-8
Description
Odourless, white bulky powder
IUPAC Name
magnesium;dihydroxide
Molecular Weight
58.32g/mol
Molecular Formula
Mg(OH)2
Canonical SMILES
[OH-].[OH-].[Mg+2]
InChI
InChI=1S/Mg.2H₂O/h;2*1H2/q+2;;/p-2
InChI Key
VTHJTEIRLNZDEV-UHFFFAOYSA-L
Melting Point
350 °C (decomp.);350 °C (decomposes)
Purity
> 99.99%
Density
2.36 g/mL
Solubility
Practically insoluble in water and in ethanol;Soluble in dilute acids;0.0009 G SOL IN 100 CC WATER @ 18 °C; 0.004 G SOL IN 100 CC WATER @ 100 °C; SOL IN AMMONIUM SALTS;Almost insoluble in alcohol
Color Form
Amorphous powder;White, hexagonal crystals;Granules
Complexity
0
Covalently-Bonded Unit Count
3
EC Number
215-170-3
Exact Mass
57.990521g/mol
Formal Charge
0
H-Bond Acceptor
2
H-Bond Donor
2
Heavy Atom Count
3
MeSH Entry Terms
Brucite;Hydrate, Magnesium;Hydroxide, Magnesium;Magnesium Hydrate;Magnesium Hydroxide;Magnesium Hydroxide (Mg(OH)4)
Monoisotopic Mass
57.990521g/mol
Odor
Odorless
Other Experimental
Imparts slight alkaline reaction to water; absorbs CO2 in the presence of water;Opaque, more or less viscous suspension from which water usually separates on standing; alkaline to litmus and phenolphthalein /Milk of Magnesia USP/;Decomposes on heating above 120 °C;Heat of formation: -924.54 kJ/mol; free energy of formation: -833.58 kJ/mol; heat capacity: 77.03 J/mol-K; Mohs' hardness = 2.5;Heat of Formation = -1096 kJ/mol;White, friable masses or bulky, white powder; at about 700 °C is converted to MgO; sol in about 3,300 parts CO2-free water; more sol in water containing CO2; sol in dilute acids with effervescence; insol in alcohol /Magnesium carbonate hydroxide/
Refractive Index
Index of refraction: 1.559, 1.580
Rotatable Bond Count
0
UNII
NBZ3QY004S
Application
Magnesium hydroxide, commonly recognized as a key component in the 'milk of magnesia,' serves a dual purpose as both an antacid and a laxative. This white, bulky powder, formed through the reaction of sodium hydroxide with a soluble magnesium salt, appears as a milk-like suspension due to its limited solubility in water. As a mild base, it effectively neutralizes excess stomach acid, providing relief from indigestion and heartburn. Additionally, the magnesium ions present enhance water content in the intestines, promoting bowel movements through osmotic effects. This dual action makes magnesium hydroxide an essential remedy for digestive discomfort.
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- 1309-42-8
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