Magnesium oxide physical properties

White or light yellow powder, odorless, tasteless, this product is insoluble in water and ethanol, melting point 2852 ° C, boiling point 3600 ° C, light burned magnesia magnesia has high refractory insulation properties. It can be converted into crystal by burning at a temperature above 1000 ° C. If it rises above 1500 ° C, it will form a burnt magnesia or sintered magnesia.

Chemical properties: Magnesium oxide is a basic oxide with the basicity of basic oxides

Exposure to air, easy to absorb water and carbon dioxide and gradually become basic magnesium carbonate, lighter products are faster than heavy products, combined with water to form magnesium hydroxide, a slightly alkaline reaction, the pH of the saturated aqueous solution is 10.3. Soluble in acid and ammonium salts are insoluble in water, and the solution is alkaline. Do not dissolve in ethanol.

The ion equation is: MgO+2H+=Mg2++H2O

MgO+2NH4+=Mg2++2NH3↑+H2O

Slowly react with water to form magnesium hydroxide

Strong refraction in the visible and near-ultraviolet range.

Classification: divided into light magnesium oxide and heavy magnesium oxide. Lightweight and bulky, it is a white amorphous powder. Odorless, tasteless and non-toxic. The density is 3.58 g/cm3. Hard to dissolve in pure water and organic solvents, solubility in water increases due to the presence of carbon dioxide. Soluble in acid, ammonium salt solution. It is converted into crystals by high temperature burning. In the case of carbon dioxide in the air, it forms a double salt of magnesium carbonate. Heavy and compact, white or beige powder. It is easy to combine with water, and it is easy to absorb water and carbon dioxide in the exposed air. It is easy to gel and harden when mixed with magnesium chloride solution.