# Talk:Copper(II) chloride

Does anyone knows if Copper(II) Chloride is soluble in 1-Propanol or 2-Propanol? (Posted by 202.156.6.54, 23 March 2006).

Almost certainly, yes, and both.  If you look in the table at the solubility in ethanol, which is very similar, you'll see that is highly soluble.  Going from methanol solubility to ethanol, you can see a trend towards lower solubility as no. of carbons increases (and solvent polarity goes down), so I'd expect a lower solubility again in 2-propanol, and even lower in 1-propanol, but it should still be quite soluble.  Note that those data are for the anhydrous compound, though (the yellow-brown form) - if you are using the hydrate (blue-green) the solubilities will be different - though the CRC lists that as solubile in ethanol too. Please post your findings here! Walkerma 15:19, 23 March 2006 (UTC)

The recent edit is not vandalism, it does rectify an error in the CAS number.  I checked [www.hazard.com an MSDS] and Alfa and the 39-4 ending is correct. It appears that the Aldrich catalogue has the incorrect CAS no., that's where the error came from.  Walkerma 06:13, 8 June 2006 (UTC)

It can easily be confirmed that the previous CAS registry number was false, as the checksum fails; [7447-39-4] is the valid CAS number for the anhydrous chloride (verified against WebElements NIST and Aldrich online), the dihydrate is [10125-13-0] (WebElements, Aldrich). Physchim62 (talk) 11:39, 8 June 2006 (UTC)

"CuCl2 also behaves as a mild Lewis acid, for example in its reaction with HCl (or other chloride sources) to form the complex ions CuCl3- and CuCl42-."
I want to ask if sodium choride can be used as chloride source?Superdvd 09:23, 18 January 2007 (UTC)

I looked at my older edition of Greenwood & Earnshaw, and NaCl can almost certainly be used.  Annoyingly they mention using LiCl, KCl, CsCl and ammonium chloride, but not sodium chloride.  Since Na lies between Li and K, it will almost certainly work, and you can probably even see that in the lab - see if there is a change of colour.  Whether or not the complex can be isolated out of solution, I'm less sure - probably the K complexes are easier to isolate, than Na, and Cs the easiest of all.  You could take a look at D. W. Smith, Coordination Chemistry Reviews, Volume 21, Issues 2-3 , 1976, Pages 93-158 (doi:10.1016/S0010-8545(00)80445-2) - that is a 65 page review of these complexes. Unfortunately our library doesn't have that.  Walkerma 16:41, 18 January 2007 (UTC)
I have never tried it experimentally with NaCl, as the complexation is so much easier with hydrochloric acid! I agree with Martin that it should work, but gievn that the concentration of free chloride in, even saturated, sodium chloride solutions is quite low, I won't guarantee anything! Physchim62 (talk) 17:09, 18 January 2007 (UTC)
Thanks for your help very much. However,when I add copper(II)chloride into sodium chloride(both are dilute solution), not much observable change, just turn a bit more yellow......Is complex formation only occur in saturated solution? I am really interest in it.Superdvd 23:18, 18 January 2007 (UTC)

Yes, I think they need to be as concentrated as possible to get a high degree complex formation - the reaction is very sensitive to concentration, I seem to recall (and think about the equilibrium constant!).  You can dissolve around 35g NaCl in 100g water, I'd guess that should be enough - though as PC says, the commonest reaction done is with HCl.  Good luck! Walkerma 03:25, 19 January 2007 (UTC)
The most important factor is the concentration of chloride ions, so you need as saturated a solution of NaCl as you can get. The concentration of the copper sulfate shouldn't matter too much, as the main factor puching the equilibrium in the other direction is the 56 mol/L of water, a concentration which you can't really change in aqueous solution! Physchim62 (talk) 17:08, 20 January 2007 (UTC)
The D. W. Smith, Coordination Chemistry Reviews, Volume 21, Issues 2-3 , 1976, Pages 93-158 (doi:10.1016/S0010-8545(00)80445-2) points out that it is really strange and that even :M.P. Vorobci and O.V. Skiba, Russ. J. Inorg. Chem., 15 (1970) 726. do not report any complexes in the phase diagramm of NaCl and CuCl2.
He argues: Only large kation form cuprate is wrong, because Li also forms them. (NH4 Ag and Tl also form cuprates). But NaCl has a high melting point and the eutectic mixture with 46%mol NaCl melts at 386°C which is near the decomposition of CuCl2 —The preceding unsigned comment was added by Stone (talk • contribs) 15:31, 5 February 2007 (UTC).

I was wondering whether copper II chloride reacts with hydrogen peroxide to form oxygen gas, hydrochloric acid, and copper I chloride.
2 CuCl2 + H2O2 --> 2 CuCl + 2 HCl + O2
The insoluble copper I chloride may then react with the hydrochloric acid to form a soluble hydrochloric acid-copper I chloride adduct.
CuCl + HCl --> HCuCl2
Just a thought. --98.221.179.18 (talk) 22:34, 3 March 2010 (UTC)

The paragraph "Safety" states that "Copper(II)chloride can be toxic and highly flammable". Flammable? How should it be? The copper is already in its highest oxidation state. The MSDS [1] gives hazard symbols for "toxic" and "harmful to environment", but NOT flammable. I am pretty sure that the statement "flammable" is an error. (Edit: See also in the infobox: "Flash point: not flammable") --Andi47 (talk) 13:30, 30 November 2015 (UTC)