When the Cu(II)Cl2 is dissolved in ethanol:DI water (70:30, v:v), the solution becomes turbid. Normally, Cu(II)Cl2 is soluble in ethanol and DI water, but it is not 100% soluble in ethanol:DI water mixture.
Dear Mehmet Ozturk thank you for this interesting technical question. According to the Wikipedia entry cited below, the solubility of CuCl2 in both ethanol and water is quite high:
Ethanol: 53 g/100 mL (15 °C)
Water: 75.7 g/100 mL (25 °C)
https://en.wikipedia.org/wiki/Copper(II)_chloride
For more information, please also have a look at the following useful link:
http://periodic-table-of-elements.org/SOLUBILITY/copper-II_chloride
When you mention that the solution becomes turbid, I don't think that large amounts of hydrated copper(II) chloride precipitate or crystallize. Chances are that due to some slightly basic conditions Cu(OH)2 precipitates as finely divided solid. In that case the turbidity can be easily removed by adding a few drops of HCl solution (hydrochloric acid). Otherwise you can also try filtration through a folded filter to obtain a clear solution again.
Good luck and best wishes! 😊
Mehmet Ozturk
Saturate the alcohol with HCl gas... Or use ammonia gas the saturate the ethanol - the cuprammonium salt is particularly stable
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