Magnesium oxide (chemical formula: MgO) is an oxide of magnesium, an ionic compound. It is a white solid at room temperature. Light-burned magnesia and magnesia exist in nature in the form of periclase, which is the raw material for magnesium smelting.

Physical property

White or light yellow powder, odorless, tasteless, insoluble in water and ethanol, melting point 2852 C, boiling point 3600 C, magnesium oxide has a high refractory insulation performance. It can be transformed into crystals by high temperature burning above 1000 C and sintered magnesia or sintered magnesia when it rises above 1500 C

Chemical Properties: Magnesium oxide is an alkaline oxide with the general properties of alkaline oxide.

Exposed to air, it is easy to absorb water and carbon dioxide and gradually become basic magnesium carbonate. Light products are faster than heavy products. Water combines to form magnesium hydroxide, which is slightly alkaline. The pH of saturated water solution is 10.3. Soluble in acid and ammonium salt, insoluble in water, its solution is alkaline. It is insoluble in ethanol.

The ionic equation is MgO+2H+=Mg2++H2O.

MgO+2NH4+=Mg2++2NH3+H2O

Slow interaction with water to form magnesium hydroxide

It has strong refractivity in the visible and near-ultraviolet light range.

Classification: Light magnesium oxide and heavy magnesium oxide. Light bulk, white amorphous powder. It is odorless, tasteless and non-toxic. The density was 3.58g/cm3. It is insoluble in pure water and organic solvents, and its solubility in water increases with the presence of carbon dioxide. It can dissolve in acid and ammonium salt solution. It is transformed into crystals by high temperature burning. When exposed to carbon dioxide in the air, magnesium carbonate compound is formed. Heavy matter is compact in volume.

White or beige powder. It is easy to combine with water and absorb water and carbon dioxide in exposed air. It is easy to gel and harden when mixed with magnesium chloride solution.

Chemical property

Name: Magnesium oxide

Commonly known as: bitter soil; lamp powder; calcined soil

Molecular formula: MgO

Molecular weight: 40.30

CAS NO.: 1309-48-4 EINECS No. 215-171-9