Talk:Hydrogen chloride

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That's a better picture. I wondered about your previous H:Cl ratio, and I was already checking up on my data. Wim van Dorst 23:29, 2005 Mar 13 (UTC)

I like the new picture better too. H Padleckas 23:39, 13 Mar 2005 (UTC)

occurrence in food[edit]

This stuff shows up quite a bit in foods because it is a product of water (which is of course in most foods) and common preservatives such as as calcium chloride. I'm planning to put some more stuff in here regarding this, because very often you chemists go bananas over industrial applications of compounds like these, and include occassionally some info on occupational levels of inhalant and dermal exposure, but rarely address nonacute symptoms or oral toxicity/bioactivity.Koyae (talk) 11:55, 11 October 2009 (UTC)

I planned more edits[edit]

I was planning more edits for this article, but looks like you beat me to some of them. Of course, it's necessary to summarize the hazards of chemicals. I'm still planning further changes, though. Eventually, a table with physical and maybe thermodynamic properties for hydrogen chloride should be added, which are distinct from a hydrochloric acid solution. That's one of the main reasons I started this new article. Also, some of the hydrogen chloride synthesis and/or production information more properly belongs here than in hydrochloric acid, although it would be ok to include it in both articles. H Padleckas 23:50, 13 Mar 2005 (UTC)

  • I have inserted the above-mentioned table with some physical properties for hydrogen chloride, but more review of the table needs to be done. Enthalpy and Entropy of formation, vaporization, and maybe fusion would be good to add. The hazards and so on should be checked. H Padleckas 23:59, 17 Mar 2005 (UTC)
  • Of course I can only agree with the feeling that more editing for both articles is good thing. The hydrochloric acid is even up for Peer Review now, since a week or two. Would it be a good idea to discuss the various changes to either article on that discussion page? Wim van Dorst 23:55, 2005 Mar 13 (UTC)

Subscripts in chemical reactions get cut off[edit]

The bottoms of the subscripts in my chemical reactions keep getting cut off. The one with water is now ok. The one with methanol is still cut off. Is there any solution to this problem?
H Padleckas 14:33, 15 Mar 2005 (UTC)

What web browser are you using, and if you're running Windows, is your default font size "normal" or "large"?
I am using America OnLine (AOL) and I am running Windows XP, but I don't know my default font size. H Padleckas 23:59, 17 Mar 2005 (UTC)

I took out the centering "macro" ("command" or whatever you call it) and now the subscripts are no longer cut off. H Padleckas 06:06, 21 Mar 2005 (UTC)

Centering molecular picture in table[edit]

Does anybody know how to center the molecular picture in the table without making it bigger?
H Padleckas 23:59, 17 Mar 2005 (UTC)

I will take care of the table, but it may take a day or two. Actually I had already a local table with some aditional properties. Cacycle 09:34, 18 Mar 2005 (UTC)

Go ahead and put them in - at your leisure. H Padleckas 10:39, 18 Mar 2005 (UTC)

Used some material from Hydrochloric acid[edit]

I've taken material relevant to hydrogen chloride gas from the History and Production sections of Hydrochloric acid and inserted it into the History, Production, and Synthesis sections of this Hydrogen chloride article. I omitted mentioning Jabir Ibn Hayyan since he probably used aqueous sulfuric acid to produce aqueous HCl acid, not HCl gas, other than fumes incidental to the acid solution. I mentioned spirit of salt or acidum salis and marine acid air, but omitted Basilius Valentinus. I mentioned Glauber, Priestly, and Davy and threw in Carl Wilhelm Scheele for good measure from the Leblanc process article, who was not mentioned in Hydrochloric acid. I also added the reaction producing sodium sulfate to the article. I also took the material on the Leblanc process and the mention of the Solvay process from Hydrochloric acid and added it to the History section of Hydrogen chloride. In History, I additionally mentioned the similar Hargreaves process, which I did not find in Wikipedia but found mentioned in another website. I also used the chemical reactions and summaries of them (including the HCl oven) from the Production section in Hydrochloric acid for the Production section of Hydrogen chloride since they actually discussed the production of HCl gas. I added a little additional information I found on the web. A separate synthesis section was included in Hydrogen chloride to discuss laboratory scale synthesis. I am not finished investigating whether some industrial scale polymerization processes produce HCl gas. Those who are working on Hydrochloric acid may want to see if they feel this information should be coordinated (or distributed) among the two HCl articles. I would like to elaborate on the Applications (or Uses) in Hydrogen chloride, e. g. to mention hydrochlorination of acetylene to vinyl choride and mention newer vinyl chloride processes involving HCl gas as an intermediate reactant, in future edits. I may someday include an Other Reactions section discussing hydrochlorination of alkenes and any other reaction HCl gas may be involved in. In the meantime, there are plenty of other things for me to work on.
H Padleckas 08:29, 24 Mar 2005 (UTC)

round and round we go[edit]

"...forms white fumes on contact with humidity. These fumes consist of hydrochloric acid which forms when hydrogen chloride dissolves in water." Xientist 00:42, 7 May 2006 (UTC)

bad source[edit] is a bad source because that page does not state any sources and because stating wikipedia as a source is a bit weird in my opinion —Preceding unsigned comment added by (talk) 01:16, 5 January 2008 (UTC)

Bond Type[edit]

Does it have a hydrogen bond? —Preceding unsigned comment added by (talk) 03:36, 20 February 2008 (UTC)

Well it certainly has bonds that involve H, but the hydrogen bonding is considered weak as indicated by its low boiling point of -85 C. Compare HF at 20 °C, not that's an effect! H-bonding is more of a N, O, F thing.--Smokefoot (talk) 04:00, 20 February 2008 (UTC)

HCl in organic solvents[edit]

Hi, in the methods for making HCL in organic solvents , I'd add NH4Cl with HSO4. It's the same as the Nacl method however the resulting (NH4)SO4 is liquid instead of a solid like NaHSO4, and so is more practical. Thanks! —Preceding unsigned comment added by Devvochem (talkcontribs) 07:12, 15 April 2008 (UTC)


According to the value in the chembox, density of HCl is 1.2 g cm-3. This is larger than that of water, though HCl is gas at STP. Is there anybody who knows information about the temperature? --Nao1958 (talk) 14:18, 11 May 2011 (UTC)

According to the CRC Handbook (91st edition), the density of hydrogen chloride is 1.490 g/L. This seems much more appropriate for a gas. It might be worth discussing the density of liquid HCl in the main article text. According to the HCl entry in Air Liquide's online Gas Encyclopedia, liquid HCl has a density of 1.191 g cm−3 at its boiling point of −85 °C. --Ben (talk) 15:06, 11 May 2011 (UTC)


The MSDS link is not accurate as it refer to a hydrochloric acid MSDS need to link to an hydrogen chloride MSDS — Preceding unsigned comment added by (talk) 16:11, 5 November 2012 (UTC)

Calculation of the Ka value[edit]

For example:

Ka(HCl) = [Cl
]÷[HCl] = (Density(Cl
)÷Molar mass(Cl
)÷Molar mass(H+
))÷(Density(HCl)÷Molar mass(HCl)) ≈ (?g/L÷35.45g/mol)×(?g/L÷1.01g/mol)÷(1.49g/L÷36.46g/mol) ≈ ?mol/L×?mol/L÷0.04mol/L

But how to get the Density(Cl
) and Density(H+
)? Or is it possible to get the [Cl
] and [H+
] directly?

Thanks. (talk) 13:07, 27 May 2014 (UTC)

User:Dirac66 answered similar question at Talk:Acid dissociation constant. DMacks (talk) 18:52, 28 May 2014 (UTC)