Magnesium oxide (MgO). An inorganic compound that occurs in nature as the mineral periclase. In aqueous media combines quickly with water to form magnesium hydroxide. It is used as an antacid and mild laxative and has many nonmedicinal uses. Magnesium oxide is an alkaline oxide,which has the generality of alkaline oxide and belongs to cementitious material. White powder (light yellow is magnesium nitride),odorless,tasteless,non-toxic,it is a typical alkaline earth metal oxide,chemical formula MgO. White powder, melting point 2852 ℃,boiling point 3600℃.relative density 3.58(25℃). Soluble in acid and ammonium salt solution, insoluble in alcohol. The solubility in water is 0.00062g/100 ml (0 ° C) 0.0086g / 100 ml (30 ° C). When exposed to air, it is easy to absorb water and carbon dioxide and gradually become basic magnesium carbonate.
