Magnesium hydroxide

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Magnesium hydroxide
Chemical formula Mg(OH)2
Molar Mass(g/mol) 58.3 
Density(g/cc) 2.34 
Melting Point(°C) 350
NFPA 704
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Thermal Decomposition
Magnesium hydroxide
350°C
MgO

Magnesium hydroxide is a close analogue of calcium hydroxide.

Uses

Primary

  • As an aqueous suspension/solution, it is known as Milk of Magnesia, which has medicinal properties:
    • as an antacid
    • as a laxative
  • as a fire retardant

Other

Natural occurrence

Hazards

Character

Production

Extraction

from seawater

Synthesis

from soluble magnesium salts

  1. Dissolve magnesium chloride or magnesium nitrate in distilled water
  2. Add calcium oxide or calcium hydroxide
    CaO(s) + H2O + MgCl2(aq) CaCl2(aq) + MgOH(s)
    Ca(OH)2(s) + Mg(NO3)2(aq) Ca(NO3)2(aq) + Mg(OH)2(s)

Testing

Purification

Storage

Disposal

See Also

References