Magnesium oxide

Magnesium oxide . Hydroscopic white solid looking mineral chemical compound. Historically known as magnesia alba. Its molecular formula is MgO .


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  • 1 Physical and chemical properties
  • 2 Obtaining and production
  • 3 Applications
    • 1 Cement
    • 2 Agriculture
    • 3 Desiccant
    • 4 Medicine
  • 4 See also
  • 5 Sources

Physical and chemical properties

Among the physical properties are melting point at 2852 ° C , boiling point at 3600 ° C, density of 3,580 g / cm 3 and a molar mass of 40,3044 g / mol .

As for the behavior in water , it reacts and the treatment with it produces Magnesium Hydroxide , MgO + H 2 = Mg (OH) 2 , but it can be reversed by heating to separate the humidity.

Obtaining and production

Magnesium oxide is produced spontaneously from metallic magnesium in contact with oxygen in the air, although it is quickly passivated at room temperature 2 Mg + O 2 = MgO

Magnesium oxide is produced by calcination of Magnesium Carbonate or Magnesium Hydroxide

MgCO 3 = MgO + CO 2 at Temp 830 K

Mg (OH) 2 = MgO + H 2O (in the presence of Heat)


The main application is as refractory material . Considering that it is physically and chemically stable at high temperatures,


MgO is one of the quality parameters in the manufacture of Portland cement in dry process plants. The chemical composition of cements is always given in the form of oxides.


The magnesium content of a fertilizer is given as MgO. To go from Mg to MgO, you just have to multiply the Mg concentration by the conversion factor 1.658.


MgO is a relatively poor desiccant, but because it neutralizes the sulfur oxide acids that are generated in the Kraft process , it is used in many libraries to preserve books.


In medicine, magnesium oxide in aqueous suspension ( milk of magnesia ) is used for acid relief as an antacid , and as a short-term laxative . It is also used to improve the symptoms of indigestion . Magnesium oxide side effects may include nausea and cramps


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