![]() ![]() So, the direct electrolysis of molten MgCl 2 in the absence of water is required because the reduction potential to obtain Mg is lower than the stability domain of water on an E h–pH diagram ( Pourbaix diagram). As it is also the case for aluminium, an electrolysis in aqueous solution is not possible as the produced metallic magnesium would immediately react with water, or in other words that the water H + would be reduced into gaseous H 2 before Mg reduction could occur. The reduction of Mg 2+ into metallic Mg is performed by electrolysis in molten salt. ![]() The Lewis acidity of magnesium chloride is reflected in its deliquescence, meaning that it attracts moisture from the air to the extent that the solid turns into a liquid.Īpplications Precursor to Mg metal Īnhydrous MgCl 2 is the main precursor to metallic magnesium. In the coordination polymer with the formula MgCl 2( dioxane) 2, Mg adopts an octahedral geometry. One derivative is tetraethylammonium tetrachloromagnesate 2. Īs suggested by the existence of hydrates, anhydrous MgCl 2 is a Lewis acid, although a weak one. Anhydrous MgCl 2 is produced industrially by heating the complex salt named hexamminemagnesium dichloride 2+(Cl −) 2.
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