Magnesium and its compounds

         (1) Ores of magnesium : Magnesite (MgCO₃) Dolomite (MgCO₃.CaCO₃), Epsomite (epsom salt) (MgSO₄.7H₂O) Carnallite (MgCl₂.KCl.6H₂O), Asbestos (CaMg₃(SiO₃)₄), Talc (Mg₂(Si₂O₅)₂.Mg(OH)₂).

         (2) Extraction of magnesium : It is prepared by the electrolysis of fused magnesium chloride which in turn is obtained from carnallite and magnesite.

         Carnallite (MgCl₂.KCl.6H₂O) can't be directly converted into anhydrous MgCl₂ by heating because all the water of crystallisation cannot be removed by heating. Moreover, strong heating may change it to MgO.

         In Dow's process, magnesium chloride is obtained from sea water as MgCl₂.6H₂O. It is rendered anhydrous by heating it in a current of dryHCl gas. The anhydrous magnesium chloride is fused with NaCl(to provide conductivity to the electrolyte and to lower the fusing temperature of anhydrous MgCl₂ and then electrolysed at 700 degree C.

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