magnesium oxide to magnesium hydroxide in water

Magnesium oxide does not react with water, but magnesium hydroxide produced after the reaction is insoluble in water, covering the surface to prevent further reaction. Therefore, grinding magnesium oxide into very fine powder and stirring vigorously in hot water can react to generate magnesium hydroxide, but magnesium hydroxide is still insoluble in water to generate suspension. Adding carbon dioxide or ammonium salt can promote the dissolution of magnesium oxide, but instead of magnesium hydroxide, magnesium carbonate or magnesium salt and ammonia water are produced. Magnesium oxide is a kind of substance, not a substance. Chemical formula is MgO, but there are many crystal forms. This is similar to the relationship between graphite and diamond. Different crystal forms and properties are very different. Magnesium oxide is a common magnesium supplement, which can be bought in pharmacies all over the country. Magnesium oxide is favored by supplement manufacturers because its manufacturing cost is relatively low. Now, magnesium oxide can be easily obtained at low cost by calcining naturally occurring minerals. In addition, magnesium oxide contains about 60% of magnesium in elemental form, ranking first among all magnesium supplements. The high content of magnesium may mislead people into thinking that this magnesium supplement is the best choice. But the highest content of magnesium in elemental form does not mean that it is the most suitable form for taking. Remember: Magnesium oxide is a non-chelated substance, so it is not easily absorbed and metabolized by human body. Studies have shown that the absorption rate of magnesium oxide is only 4%, which is relatively low compared with other forms of magnesium supplements.