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Magnesium chloride, chemically represented by the formula MgCl₂, is an inorganic compound widely recognized for its diverse applications across industrial, medical, and consumer sectors. With a CAS number of 7786-30-3, this white crystalline solid is highly soluble in water, forming a strongly hygroscopic substance that readily absorbs moisture from the atmosphere. The compound exists in various hydrated forms, with the hexahydrate (MgCl₂·6H₂O) being the most common commercial variant.
In the industrial realm, magnesium chloride serves as a critical de-icing agent due to its effectiveness at lowering the freezing point of water, making it superior to sodium chloride in certain cold climates while causing less corrosion to concrete and vehicles. It plays a pivotal role in the production of metallic magnesium through electrolysis, acting as a primary raw material for extracting the metal via the Dow process. Furthermore, it is extensively utilized in dust control on unpaved roads, where its hygroscopic nature keeps road surfaces moist, thereby minimizing airborne particulate matter.
The chemical also finds significant use in the food industry as a coagulant for tofu production, imparting a firm texture to soy milk. In healthcare, it is employed intravenously to treat hypomagnesemia, eclampsia, and asthma exacerbations, leveraging its ability to regulate nerve function and muscle contraction. Additionally, magnesium chloride is a popular ingredient in bath salts and wellness products, promoted for its potential benefits in relieving muscle pain and reducing stress through transdermal absorption. Its versatility extends to the manufacturing of textiles, fire retardants, and cement additives. As a stable and cost-effective resource, magnesium chloride remains indispensable in modern manufacturing and daily life, bridging the gap between heavy industry and personal health care with broad utility and safety profiles when handled according to established guidelines.