![]() ![]() The hydrated form can be prepared from cobalt(II) hydroxide or cobalt(II) carbonate and hydrochloric acid.Ī common use for cobalt(II) chloride was for the detection of moisture, for example in drying agents such as silica gel this use was disscontinued due to the carcenogenic nature of cobalt salts. ![]() CoCl 2♶H 2O is deliquescent and the anhydrous salt CoCl 2 is hygroscopic, readily converting to the hydrate.Ĭobalt(II) chloride can be prepared in its anhydrous form from cobalt metal and chlorine gas: It has the interesting property that a concentrated aqueous solution is red at room temperature, but becomes blue when heated. This species dissolves readily in water and alcohol. In the solid state CoCl 2♶H 2O contains trans-♲H 2O, two water molecules in its formula unit being water of crystallization. ![]() The rose hexahydrate is one the most common cobalt compounds in the laboratory.Īqueous solutions of both CoCl 2 and the hydrate contain the species 2+. Because of this dramatic color change and the ease of the hydration/dehydration reaction, "cobalt chloride" is used as an indicator for water. CoCl 2 is blue, and CoCl 2♶H 2O is deep rose. Rhodium(III) chloride Iridium(III) chlorideĮxcept where noted otherwise, data are given for materials in their standard state (at 25 ☌, 100 kPa) Infobox disclaimer and referencesĬobalt(II) chloride is the chemical compound with the formula Co Cl 2, although the term is used also to refer to the hexahydrate, which is a different chemical compound. 2 Dangerous for the environment ( N)Ĭobalt(II) fluoride Cobalt(II) bromide Cobalt(II) iodide Cobalt(II) oxide ![]()
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