Basic Copper Chloride is prepared commercially by the a […]
Basic Copper Chloride is prepared commercially by the action of chlorination of copper:Cu + Cl2 + 2 H2O → CuCl2(H2O)2 .Copper metal itself cannot be oxidised by hydrochloric acid, but copper-containing bases such as the hydroxide, oxide, or copper(II) carbonate can be reacted with hydrochloric acid.Once prepared, a solution of CuCl2 may be purified by crystallization. A standard method takes the solution mixed in hot dilute hydrochloric acid, and causes the crystals to form by cooling in a CaCl2-ice bath.
There are indirect and rarely used means of using copper ions in solution to form copper(II) chloride. Electrolysis of aqueous sodium chloride with copper electrodes produces (among other things) a blue-green foam that can be collected and converted to the hydrate. While this is not usually done due to the emission of toxic chlorine gas, and the prevalence of the more general chloralkali process, the electrolysis will convert the copper metal to copper ions in solution forming the compound. Indeed, any solution of copper ions can be mixed with hydrochloric acid and made into copper chloride by removing any other ions.
Copper(II) chloride occurs naturally as the very rare anhydrous mineral tolbachite and the dihydrate eriochalcite. Both are found near fumaroles.
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