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|Section2= |Section3= |Section7= |Section8= }} Cobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the formula CoCl2. It is usually supplied as the hexahydrate CoCl2•6H2O, which is one of the most commonly used cobalt compounds in the lab. The hexahydrate is deep purple in color, whereas the anhydrous form is sky blue. A blend would be mauve. Because of the ease of the hydration/dehydration reaction, and the resulting color change, cobalt chloride is used as an indicator for water in desiccants. Niche uses of cobalt chloride include its role in organic synthesis and electroplating objects with cobalt metal. Cobalt chloride has been classified as a Substance of very high concern by the European Chemicals Agency as it is a suspected carcinogen. ==Properties== Aqueous solutions of both CoCl2 and the hydrate contain the species ()2+. They also contain chloride ions. In the solid state CoCl2•6H2O consists of the molecule ''trans''-() and two molecules of water of crystallization. This species dissolves readily in water and alcohol. Concentrated aqueous solutions are red at room temperature but become blue when heated.〔''The Merck Index'', 7th edition, Merck & Co, Rahway, New Jersey, USA, 1960.〕 CoCl2•6H2O is deliquescent and the anhydrous salt CoCl2 is hygroscopic, readily converting to the hydrate. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cobalt(II) chloride」の詳細全文を読む スポンサード リンク
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