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Aluminum chloride is a white or light-yellow crystalline solid with a hydrogen chloride odor. It is used as a catalyst in organic synthesis, electrolytic production of aluminum, and other applications. Hans Christian Oersted first prepared anhydrous aluminum chloride in 1825 by passing chlorine gas through a heated mixture of alumina and carbon. The evaporation density of anhydrous aluminium chloride at 400°C has been found to be 133. On this basis, its formula is Al 2 Cl 6. The composition formula of anhydrous aluminium chloride is as follows. According to the above structure formula, each aluminium atom binds to three chlorine atoms co-conjugated and one chlorine atom is joined by a cohesive bond. Chlorine atoms form a tetrahedral shape around each aluminium atom. The vapor density of anhydrous aluminium chloride decreases with ... Aluminium chloride is also referred to as aluminium trichloride or aluminium (III) chloride. The compound is formed when aluminium and chlorine are reacted together. Its chemical formula is written as AlCl 3. As for physical appearance, aluminium chloride is usually white in colour.