Magnesium oxide (chemical formula: MgO) is an oxide of magnesium, an ionic compound. It is a white solid at room temperature. Magnesium oxide exists in nature in the form of magnesite, which is the raw material for magnesium smelting. White fine powder. Odorless. Due to different preparation methods, there are light and heavy. It has strong refractive property in the visible and near-ultraviolet range. Easy to absorb water and carbon dioxide in the open air and gradually become alkaline magnesium carbonate, lighter than heavy faster, combined with water to generate magnesium hydroxide, slightly alkaline reaction, saturated aqueous solution of pH 10.3. but very soluble in dilute acid, slightly soluble in pure water, due to the presence of carbon dioxide and increase its solubility. Insoluble in ethanol. Relative density (d254) 3.58. melting point 2852℃. Boiling point 3600℃. Active magnesium oxide, white or light yellow powder, odorless, tasteless, the product is insoluble in water or ethanol, slightly soluble in ethylene glycol, melting point 2852 ° C, boiling point 3600 ° C, magnesium oxide has a high degree of fire-resistant insulation properties. By 1000 ℃ above high temperature burning can be transformed into crystals, rise to 1500 ℃ above the death of burning magnesium oxide (also known as magnesium sand) or sintered magnesium oxide. Chemical properties: magnesium oxide is an alkaline oxide, with alkaline oxides, belonging to the cementitious materials. Exposed to the air, easy to absorb water and carbon dioxide and gradually become alkaline magnesium carbonate, light products more quickly than heavy products, combined with water to generate magnesium hydroxide, a slightly alkaline reaction, saturated aqueous solution of pH 10.3. soluble in acids and ammonium salts are difficult to dissolve in water, and its solution is alkaline.
Insoluble in ethanol. It has strong refractive property in visible and near-ultraviolet range. Classification:There are two kinds of light magnesium oxide and heavy magnesium oxide. Light volume, white amorphous powder. Odorless, tasteless and non-toxic. Density 3.58g/cm3.Difficult to dissolve in pure water and organic solvents, solubility in water is increased by the presence of carbon dioxide. Soluble in acid, ammonium salt solution. Converted into crystals by high temperature burning. When encountered with carbon dioxide in the air to generate magnesium carbonate complex salt. Heavy volume compact, white or beige powder. Easy to combine with water, easy to absorb water and carbon dioxide in the air. Mixed with magnesium chloride solution is easy to gelatinization and hardening.
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