Talk:Ammonia

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Ammonia was one of the Natural sciences good articles, but it has been removed from the list. There are suggestions below for improving the article to meet the good article criteria. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.

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December 9, 2005	Good article nominee	Listed
April 24, 2006	Featured article candidate	Not promoted
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July 26, 2007	Featured article candidate	Not promoted
August 8, 2009	Good article reassessment	Delisted
Current status: Delisted good article

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Image of ammonia (maybe liquid)[edit]

I think that an image should be added (given how important ammonia is), possibly similar to the pages for nitrogen or oxygen where the image shows the condensed liquid boiling. Sticklink (talk) 20:16, 24 January 2023 (UTC)[reply]

I've checked commons and the existing options are poor. Aqueous ammonia is a common laboratory reagent, so I don't think it would be too hard for someone to take a picture of a Winchester of it . Liquid anhydrous ammonia is trickier and also not very impressive to look at (clear colourless liquid - dull). The only way to make it interesting is to drop a shard of sodium in to make it look like this Project Osprey (talk) 21:48, 24 January 2023 (UTC)[reply]

ammonia angle[edit]

The article indicates that the same source indicates two different H-N-H angles: ... with an experimentally determined bond angle of 106.7° and ... therefore the bond angle is not 109.5°, as expected for a regular tetrahedral arrangement, but 106.8°.

As far as I know, both angles are wrong. In all the literature, I know (e.g. C.E. Mortimer und U. Müller: Chemie – Das Basiswissen der Chemie, page 130), I just saw that it's 107.3°. Can someone confirm that? FailXD (talk) 17:02, 5 September 2023 (UTC)[reply]

LD50[edit]

The LD50 is given as 0.015 ml per kg, which is far too low. The figure 0.015 would make sense if it referred to ml of liquid ammonia, or mg of ammonia, but not ml of gaseous ammonia. Someone knowledgeable in editing chemboxes should correct this to mg per kg or indicate that it refers to liquid ammonia, rather than the gaseous form ammonia has under standard conditions. Ammonia gas is about 1000 times less dense than liquid ammonia. The ICSC0414 data sheet cited farther down in the chembox gives a permissible level of 14 mg per cubic meter, which is equivalent to 0.014 mg per ml. CharlesHBennett (talk) 22:47, 3 February 2024 (UTC)[reply]

I wasn't able to find a human LD50 and the permissible level isn't really equivalent. I substituted a rat oral LD50 from a gas supplier SDS. Recon rabbit 19:28, 19 April 2024 (UTC)[reply]

Flash point[edit]

Most sources agree that ammonia does not have a traditional flash point, as it is a gas a standard temperature and pressure and the definition of flash point relies on the temperature at which liquid fumes become flammable. What is currently listed is the critical temperature, which is the temperature above which ammonia cannot form a liquid. The more relevant standard for ammonia flammability would be the lower explosive limit, which is the concentration in air at which ammonia becomes ignitable. 2601:281:8000:78E0:309D:DD9D:FB1F:A521 (talk) 18:34, 19 April 2024 (UTC)[reply]

It looks like the explosive limit is already listed at 15.0%-33.6%. Recon rabbit 19:27, 19 April 2024 (UTC)[reply]

"Liquid ammonia"[edit]

The Liquid section had a sentence that stated the liquid could be carried around a lab without refrigeration or a pressure vessel. This seems very unlikely considering that even with its high enthalpy of vaporization every source I can find says that liquid anhydrous ammonia vaporizes when exposed to air. I changed the section to reflect this - did it mean aqueous ammonia? Recon rabbit 20:16, 19 April 2024 (UTC)[reply]