Talk:Copper(II) hydroxide
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removed all the scrolling stuff! --негіднийлють (Reply|Spam Me!*) 06:40, 29 November 2005 (UTC)
Why is there such a detailed description of the home preparation of this compound? This isn't something that is synthesized on a laboratory scale anyways. Seems like something it's more suited for a Wikibook recipe. Chris Barile 05:50, 13 April 2007 (UTC)
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[edit] New Organization Proposal
I think that this article should be organized in a different way. Anything regarding the making of copper hydroxide should be under a new section called "manufacture", and anything regarding its uses should be under "uses". It should be added that it's also a pesticide (more general term than fungicide). And a more adequate table like the one on the copper sulfate article should be used rather than the one used right now in this article. Slartibartfast1992 22:19, 21 April 2007 (UTC)
[edit] Melting Point
I had put "decomposes to CuO" as the melting point because copper (II) hydroxide decomposes before it melts. For example, in boiling water the precipitate will rapidly turn to the black oxide. If you don't want to put this information under the melting point, it should at least be in the article somewhere as it is important. Chris Barile 05:07, 7 June 2007 (UTC)
Ah. Is there any exception, under special conditions maybe, where it ments at a certain point? If not, sorry to have intefered, feel free to add it in there. I suggest placing a dash first, then placing "decomposes into CuO" between parentheses. Slartibartfast1992 01:10, 8 June 2007 (UTC)
Never mind, you seem to have done that already. Also see you placed the standard table there. Looks good. Slartibartfast1992 01:12, 8 June 2007 (UTC)
No, I highly doubt that it ever melts under standard conditions because CuO is much more thermodynamically stable. Also, no literature mentions a melting point. I found a decompostion point of 185°C, which corresponds nicely with a book I have that states that the dry product is stable at 100°C. Lastly, should this article still be considered a stub? I've looked hard and can't find too much more noteworthy information. Chris Barile 01:31, 8 June 2007 (UTC)
Hmmm... I'll start a discussion called "stub?" so we can discuss the criterion for stubs and see how it applies to this article. I won't be available to discuss now, though. Maybe later on or tomorrow. Slartibartfast1992 02:15, 8 June 2007 (UTC)
[edit] Stub?
I have the opinion that this article should remain a stub until we find some historical data on Copper Hydroxide. However, the article has advanced a lot, and once this information (maybe some more too) is obtained, we can remove the stub template. Any other opinions? Slartibartfast1992 02:16, 8 June 2007 (UTC)
I agree that a bit of history on chemical compounds is nice, but I can't find much information about Cu(OH)2. I don't think copper hydroxide has an discoverer per se but it most probably was used by the alchemists (easily made with lye and blue vitriol). I did find this information in Watts (1872):
"Much of the blue verditer or Bremen green which occurs in commerce, consists of hydrated cupric oxide, prepared by precipitating a solution of sulphate of copper with caustic potash, washing the precipitate, again taking it with caustic potash, and lastly washing it thoroughly."
(Back then, it was mistakingly labeled it as hydrated cupric oxide written as CuO-H2O.) It seems that blue verditer was historically an important pigment (http://www.naturalpigments.com/detail.asp?PRODUCT_ID=417-11B) so copper hydroxide was produced on an industrial scale.
I also think it may be good to add that several? minerals are comprised at least partially of copper hydroxide (ie azurite).
I can put together some sentences with this information if you think it should be included in the article. Chris Barile 05:32, 8 June 2007 (UTC)
- That is plenty of information. We should include all uses in history under a section called "History", which, in my opinion, should be positioned first. Then I think that the sections "Synthesis" and "Reactions" should be merged under one section called "Chemical Properties" or something of the sort (personally, I think "Chemical Properties" is not that good, so I'll try to come up with something else). Uses nowadays should be put after that section. Finally, the last section (except for "See Also" and "References") should be "Copper Hydroxide in nature.
I might be able to get a good picture of azurite for ths section.Slartibartfast1992 14:39, 9 June 2007 (UTC)
- Wait, I read that link of yours, it said that that product was made of "the same Copper Carbonate that makes up azurite. That rules out two things: the placing of azurite as a mineral sample of Copper Hydroxide, and the using of your link as a reference. Slartibartfast1992 14:45, 9 June 2007 (UTC)
Azurite is chemically 2CuCO3 • Cu(OH)2, so it's part hydroxide and part carbonate. There are other minerals such as malachite with different ratios. In my opinion, I think it would still be considered useful to mention that copper hydroxide makes up part of these minerals. I think I read somewhere (will try to find where) that pure copper hydroxide does exist as a mineral, but this is very uncommon because carbon dioxide from the atmosphere converts the hydroxide to the carbonate. Chris Barile 21:10, 9 June 2007 (UTC)
- That fact about carbon dioxide turning copper hydroxide into carbonate should definitely be included in the section "Copper Hydroxide in Nature". About the ratios in minerals, that should be the main point in that section. Examples such as Azurite and malachite should also be listed. Slartibartfast1992 04:18, 10 June 2007 (UTC)
I made the changes we discussed and went ahead and removed the stub since now there is a good amount of information. Chris Barile 20:54, 10 June 2007 (UTC)
- Wow, you definitely took this article out of stubhood, if that's a word. Congratulations on a job well done. Slartibartfast1992 01:18, 11 June 2007 (UTC)
[edit] Finishing Touches
What more can be done to make this an 'A' article? I agree with the decision to remove the 'how to' section. I initially proposed this quite a long time ago. I've fixed the structure error in the hydrazide reaction (at least I think I did so correctly...it's really late right now!). I might be able to take some pictures of some nice copper hydroxide crystals. Chris Barile 11:19, 1 November 2007 (UTC)
Oh and the source for the organic reagent section is Paquette, Leo A. (1995). Encyclopedia of Reagents for Organic Synthesis, 8 Volume Set. Wiley. ISBN 0-4719-3623-5. I'm not sure why the last two references there are labeled 1 and 2, maybe somebody can fix this for me? Chris Barile 11:23, 1 November 2007 (UTC)
- The ones previously in the references section are actually footnotes, since they adhere to only one sentence (the numbers as superscript beside a sentence). The latter two are references, so they don't go with only one particular sentence. I'll fix this. --Slartibartfast1992 22:12, 1 November 2007 (UTC)
What is shown in the picture? A chlorate cell? Dan Smith70.171.235.149 (talk) 15:34, 20 November 2007 (UTC)
It is a picture of the electrolysis of a solution of a soluble copper salt to form copper hydroxide. This procedure was previously described in older versions of this article, but it has since been deleted (not entirely sure if this was 100% justified). Chris Barile (talk) 09:43, 6 December 2007 (UTC)
