Physical properties of MgO

White light powder, odorless, tasteless, insoluble in water and ethanol, melting point 2852 ℃, boiling point 3600 ℃, magnesium oxide has high fire resistance and insulation properties. It can be transformed into crystal by high temperature sintering above 1000 ℃, and dead burned or sintered magnesia will be formed when the temperature is above 1500 ℃.
Chemical properties: magnesium oxide is an alkaline oxide with the general properties of basic oxide
Exposed to the air, it is easy to absorb water and carbon dioxide and gradually become basic magnesium carbonate. The light product is faster than the heavy product. It combines with water to form magnesium hydroxide, which is slightly alkaline. The pH of saturated water solution is 10.3. It is soluble in acid and ammonium salt, but insoluble in water, and its solution is alkaline. Insoluble in ethanol.
The ion equation is: MgO + 2H + = Mg2 + + H2O
MgO+2NH4+=Mg2++2NH3↑+H2O
It reacts slowly with water to form magnesium hydroxide
It has strong refraction in the visible and near ultraviolet range.
Classification: light magnesium oxide and heavy magnesium oxide. Light and fluffy, white amorphous powder. Odorless, tasteless and nontoxic. The density was 3.58 g / cm3. It is difficult to dissolve in pure water and organic solvents, and its solubility in water increases due to the presence of carbon dioxide. It is soluble in acid and ammonium salt solution. It is transformed into crystal by high temperature burning. In the presence of carbon dioxide in the air, magnesium carbonate is formed. It is white or beige powder with dense volume. It is easy to combine with water and absorb water and carbon dioxide in the open air. It is easy to gel and harden when mixed with magnesium chloride solution.