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"For example, at room temperature, only 0.4% of all acetic acid molecules are dissociated. Electronegative substituents give stronger acids."
I'm not a chemist, but the above sentence confused me greatly. At pH 7, nearly *all* acetic acid molecules are dissociated, right?
I imagine that this might refer to a 1.0 M solution (which has a pH of 2.4), as stated in the Acetic Acid page: A 1.0 M solution (about the concentration of domestic vinegar) has a pH of 2.4, indicating that merely 0.4% of the acetic acid molecules are dissociated. — Preceding unsigned comment added by 5.179.82.4 (talk) 09:10, 24 May 2013 (UTC)[reply]
what is sodium benzoates lewis structure?
Why are you asking something like that on here? This isn't a help page. I don't mean to be rude, but there are better places to post questions like that.
Regarding the flag on the main page. Unless you are planning on having a section on carboxylic acid derivatives (which is not a bad idea), I don't think merging the carbonyl article with this one is a good idea. What about aldehydes, esters, ketones, etc.? Dawhitfield 00:24, 7 August 2005 (UTC)[reply]
I think it's about merging with carboxyl, not carbonyl.
There should probably be a section about protecting acids as esters. —Preceding unsigned comment added by 68.10.7.182 (talk) 07:43, 31 March 2008 (UTC)[reply]
Why does this page focus on 'Common Names' (as they are referred to) rather than IUPAC names? Is Ethanoic acid not more common than Acetic acid now-a-days? Are IUPAC names not the official names now? Jklsc (talk) 11:13, 7 May 2011 (UTC)[reply]
Iscarbonic acid (HOCOOH) a carboxylic acid? --Damian Yerrick (☎) 02:38, 15 December 2006 (UTC)[reply]
Generally no. It is usually considered an inorganic acid. Also, it easily decomposes to CO2 and water. —Preceding unsigned comment added by 68.10.7.182 (talk) 07:40, 31 March 2008 (UTC)[reply]
The article says: "Carboxylic acids are polar", and I can understand why, but why is it on certain molecules, adding a carboxylic acid reduces the hydrophilicity / increases the lipophilicity, e.g:
5-hydroxy-tryptamine is fairly polar and can't cross the BBB, and 5-hydroxy-α-carboxyl-tryptamine (5-OH-tryptophan) is fairly non-polar and can cross the BBB.
What is the cause of this? --Mark PEA 19:48, 26 March 2007 (UTC)[reply]
Pardon my ignorance, but is the proton of a carboxyl group fixed to one oxygen, or can it jump between the two? Presumably in water solution the H+ can leave one oxygen and reattach to the other; but what about in water-free environments (pure solid, liquid or gas)? In the dimeric form, can the two hydrogens simultaneously jump across the hydrogen bonds and bond to the facing oxygen, while the C=O bonds swap with the C-O bonds? What are the energy barriers for these swaps? All the best, --Jorge Stolfi (talk) 14:02, 17 November 2009 (UTC)[reply]
I don't know where anyone got this number. From the pKa, it seems that at pH 7 nearly all of it is deprotonated. At [A-]=[H+] I get 0.4% deprotonation. This website http://www.molecularsoft.com/help/acid_and_base-weak_acid_base_dissociation.htm also comes up with the value 0.4%. Am I doing something wrong? Its 0.02% at pH 0 but thats hardly reasonable. —Preceding unsigned comment added by 128.6.22.134 (talk) 17:18, 23 March 2011 (UTC)[reply]
This page is a redirect from Carboxyl group. However, an explicit definition of carboxyl group is not provided. I don't have a chemistry background, but I'd led to assume that the carboxyl is the carbon double bonded to an oxygen atom and singly bonded to a hydoxyl group. If someone iwth more expertise than me could update the page I an other users would appreciate it. 68.194.106.90 (talk) 16:56, 10 April 2011 (UTC)Comma Service[reply]
It reads like an upper-level textbook instead of a few-sentence summary accessible to educated laymen. It's fair to expect Wikipedia readers to have some education, but remember that nearly all are laymen. I'd fix it myself if I knew enough to take it on.—PaulTanenbaum (talk) 05:02, 9 March 2014 (UTC)[reply]
"A carboxylic acid /ˌkɑrbɒkˈsɪlɪk/ is an organic compound that contains a carboxyl group…"
— Just one?
"…Carboxylic acids occur widely and include the amino acids and acetic acid (as vinegar)."
— So not just one? Xkit (talk) 22:43, 31 December 2015 (UTC)[reply]
Would be nice to explain what is implied by the parenthesis in the R-C(O)OH notation. Normally they are used to separate a functional group, particularly if it comes with a repetitions subscript, but neither applies here... I can understand why R-COOH is preferred to R-CO2H, but the parenthesis are confusing... — Preceding unsigned comment added by 12.104.156.31 (talk) 21:52, 20 August 2015 (UTC)[reply]
The comment(s) below were originally left at Talk:Carboxylic acid/Comments, and are posted here for posterity. Following several discussions in past years, these subpages are now deprecated. The comments may be irrelevant or outdated; if so, please feel free to remove this section.
Carboxyl group redirects here. Rated "high" as high school/SAT biology content. The article needs a section on biological context, e.g. carboxyl groups on amino acids etc. - tameeria 05:26, 19 February 2007 (UTC)[reply] |
Last edited at 05:26, 19 February 2007 (UTC). Substituted at 10:52, 29 April 2016 (UTC)
Can anybody tell which is correct, carboxy group or carboxyl group, based on the appropriate definition? In our country, they tell carboxy group is the canonical name that IUPAC defined, but I cannot find the source. Thank you. Wordmasterexpress (talk) 08:06, 15 April 2019 (UTC)[reply]