![]() nH 2O ( n = 6, 12) does not occur straightforwardly.The thermal dehydration of the hydrates MgCl 2 In the hexahydrate, the Mg 2+ is also octahedral, but is coordinated to six water ligands. Several hydrates are known with the formula MgCl 2 MgCl 2 crystallizes in the cadmium chloride CdCl 2 motif, which features octahedral Mg centers. Structure, preparation, and general properties It can also be prepared from magnesium carbonate by a similar reaction. In the Dow process, magnesium chloride is regenerated from magnesium hydroxide using hydrochloric acid: Some magnesium chloride is made from evaporation of seawater. Some deposits result from high content of magnesium chloride in the primordial ocean. The mineral bischofite ( MgCl 2♶H 2O) is extracted (by solution mining) out of ancient seabeds, for example, the Zechstein seabed in northwest Europe. In the Jordan Valley, it is obtained from the Dead Sea. In North America, it is produced primarily from Great Salt Lake brine. Magnesium chloride can be extracted from brine or sea water. Hydrated magnesium chloride is the form most readily available. Anhydrous magnesium chloride is the principal precursor to magnesium metal, which is produced on a large scale. These compounds and their solutions, both of which occur in nature, have a variety of practical uses. These salts are colorless or white solids that are highly soluble in water. ![]() nH 2O, where n can range from 1 to 12.Magnesium chloride is an inorganic compound with the formula Mg Cl 2. ![]()
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