Magnesium hydroxide CAS 1309-42-8 is an inorganic substance with the chemical formula Mg (OH) 2. It is a white amorphous powder or colorless hexagonal column crystal, soluble in dilute acid and ammonium salt solutions, almost insoluble in water, partially ionized in water, and weakly alkaline in aqueous solutions. Heating to 350 ℃ to lose aquatic magnesium oxide, a natural mineral of magnesium hydroxide, can be used for sugar and magnesium oxide production. Due to the abundant content of magnesium hydroxide in nature and its chemical properties similar to aluminum, users have started using magnesium hydroxide instead of aluminum chloride for fragrance products. Used as an analytical reagent and also in the pharmaceutical industry.

Chinese name: Magnesium hydroxide

Foreign name: magnesium dihydroxide

Chemical formula: Mg (OH) 2

Molecular weight: 58.320

CAS login number: 1309-42-8

EINECS login number: 215 170 3

Melting point: 350 ℃ (decomposition)

Water solubility: almost insoluble

Density: 2.36 g/cm ³

Appearance: White amorphous powder or colorless hexagonal column crystal

Application: Pharmaceutical Industry

Physical and chemical properties

physical property

Density: 2.36 g/cm3

Melting point: 350 º C (decomposition)

Appearance: White amorphous powder or colorless hexagonal column crystal

chemical property

Magnesium hydroxide is a moderately strong base (with a low solubility and weak alkalinity in the solution, sometimes treated as a weak base). It is dehydrated and decomposed when heated to 623K (350 ℃): Mg (OH) 2 → MgO+H2O, easily soluble in acid or ammonium salt solutions. Like magnesium oxide, it is easy to absorb carbon dioxide in the air, gradually forming basic carbonates composed of 5MgO · 4CO2 · xH2O. It decomposes into magnesium oxide and water above 350 ℃, but can only be completely dehydrated above 1800 ℃.

Application

Magnesium hydroxide is an excellent flame retardant for plastic and rubber products. As a flue gas desulfurization agent in terms of environmental protection, it can replace caustic soda and lime as a neutralizer for acidic wastewater. It is also used as an oil additive for corrosion prevention and desulfurization. In addition, it can also be used for refining in the electronics industry, pharmaceuticals, sugar, as insulation materials, and in the manufacturing of other magnesium salt products.

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