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)

CAS Number

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)

Complex formation using NaCl

"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).

Reaction of Copper II chloride with Hydrogen Peroxide

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)

Copper(II) chloride flammable??

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)

GA Review

The following discussion is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

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This review is transcluded from Talk:Copper(II) chloride/GA1. The edit link for this section can be used to add comments to the review.

Reviewer: Amitchell125 (talk · contribs) 06:55, 18 August 2023 (UTC)

Happy to review the article. AM

Thank you for taking up the review! I am quite busy with my own review, so it may take me some time to address the comments. Keres🌕Luna ^edits! 14:57, 20 August 2023 (UTC)

Review comments

Lead section / infobox

Link monoclinic (Monoclinic crystal system); anhydrous (anhydrous); dihydrate. Done. Keres🌕Luna edits! 14:32, 22 August 2023 (UTC) Is the anhydrous structure in the infobox needed? It is there as an introductory image to the article; a lot of chemical articles have the structure as its lead image. Keres🌕Luna edits! 14:32, 22 August 2023 (UTC) Understood. AM There appears to be a ‘verify’ tag at the bottom of the infobox. That is for verifying the Identifiers in the chembox and was automatically maintained by CheMoBot until 2018. I don't think the infobox must be verified to get GA, as even featured articles such as rhodocene have this. Keres🌕Luna edits! 14:32, 22 August 2023 (UTC) Understood. AM

1 Structure

Link electron; antibonding (Antibonding molecular orbital); ligands. Done. CuCl2 – introduce the chemical with its full name (the text of the article does not follow on from the lead section). Done. Left the dihydrate with its formula. Motif – ‘form’? (motif has several technical meanings in chemistry, I’m unclear the term is correct in this context). Replaced with the word 'structure'. Imo the last paragraph does not belong in this section, as it is not about the structure. The magnetism of a compound is very closely related to its structure so I would leave it in. Understood. AM Consider linking copper. Done.

2 Properties and reactions

If possible, link complexes. Linked to coordination complex. Link concentration; ion. Done. Linked chloride ion to chloride. Link base; precipitates (Precipitation (chemistry), the links will need to be separated); fungicide. Done. Rearranged to the sentence. Link oxidant (Oxidizing agent); melting point; reductant (Reducing agent). Done. Convert 498 °C; 630 °C, and other temperatures in the text. I'm not sure what you mean here, could you clarify? Keres🌕Luna edits! 18:30, 22 August 2023 (UTC) Apologies for not being clearer, e.g. {{convert|498|C}}, which produces '498 °C (928 °F)'. AM Done. I’m not sure extrapolated is correct – ‘calculated’? Extrapolated is correct in this case. Ha, it's a graphical term only in my experience. AM Link dimer (Dimerization (chemistry)). Done. Linked some others too.

3 Preparation
Link exothermic; electrodes; foam (as the word has a technical meaning). Done.

3.1 Natural occurrence

Imo this subsection belongs in the properties section. Thoughts? I think it should have its own section like the other chemistry GAs. That's not quite what I meant. My suggestion was that this subsection stays intact with its own title, but is moved out of this section. It could for instance be a section by itself, or a subsection of Properties. Amitchell125 (talk) 06:32, 25 August 2023 (UTC). I was suggesting that it be a section by itself. Keres🌕Luna edits! 14:10, 25 August 2023 (UTC) Great, that will work. AM Done. Cu mines – ‘copper mines’. Changed. arising among Cu ore beds oxidation zones in arid climate (also known from some altered slags) – is hard to follow, and looks as if it needs to be copy edited to make the text clearer. I changed the sentence and deleted some useless parts.

Uses

is this section title needed? I don;t see why the two subsections that follow it can’t be raised to level 3. Raised. Link Wacker process; alpha position (Locant#Greek_letter_locants). Done. (DMF) is redundant, as the abbreviation does not reappear. Ditto (EC) below. Removed. Link catalyst. Done. Copper–chlorine cycle – has no capital. Done. w/w – should be linked. Done. also is redundant here. Done. emit green-blue - ‘emit green-blue light’. Done. Amend It is also used – presumably to ‘Copper(II) chloride is used’ (also is redundant here). Done.

5 Safety and biological impact
Link ppm (Parts-per notation); blood pressure; chromosomal aberrations (Chromosome abnormality); mitotic (Mitosis); genotoxicity; denitrifying bacteria. Done.

6 Notes

I’m unclear about why the note is needed. Melting points are usually determined experimentally, not extrapolated. To account for this, the note was added. Keres🌕Luna edits! 00:49, 25 August 2023 (UTC) Apologies for not being clearer. See MOS:CIRCULAR for why the link may be useful, but is to be avoided. Amitchell125 (talk) 06:23, 25 August 2023 (UTC) Ok, the note was removed, as I think it isn't useful enough to stay. Keres🌕Luna edits! 14:14, 25 August 2023 (UTC)

7 References
Spot checks seems fine. Ref 4 / 5 / 13 / 15 require page numbers for the text to be verified. Done. Ref 7 (Brustolon) has an incorrect author. Fixed. Ref 17 should read ‘pp. 220-223’. Done. Ref 20 (Morris et al) has an incorrect link. Fixed. Refs 21 to 24 need a full citation. Done. N What makes you think Ref 30 (Clark) is a reliable source?

8/9 Further reading / External links
(Not GA) There seems a lot here. Bearing in mind that these sections should really only lead to accurate, on-topic additional information that is not included in the article’s text, the lists should be checked, and any inappropriate sources removed. According to the essay Wikipedia:Further reading, the list should be bulleted. Done.

On hold

I'm putting the article on hold for a week until 30 August to allow time for the issues raised to be addressed. Regards, Amitchell125 (talk) 09:37, 22 August 2023 (UTC)

Passing

Apart from one slightly questionable source in the References section, everything now looks good, so I'm passing the article. Great work, Amitchell125 (talk) 15:59, 25 August 2023 (UTC)

The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.