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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by Aldebaran on April 29, 2025, 08:02:53 AM »Wikipedia has information about olfactory fatigue which may be of interest to you.
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Generic Discussion / Re: Artifical Inteligence (AI) abilities and disabilities in chemistry
« Last post by Borek on April 29, 2025, 02:58:31 AM »It definitely has a potential, and intuition (based on some minimal/general understanding of how it works, so no hard data behind) tells me it can be quite efficient in organic chemistry.
Basically predicting outcome of a reaction in orgo is about understanding correlations between structures existing in reacting molecules and possible outputs. And AI proved to be highly capable of finding correlations between elements it works on, that's how LLMs work.
I am not following literature, but I would be highly surprised if there are no papers on the subject.
Basically predicting outcome of a reaction in orgo is about understanding correlations between structures existing in reacting molecules and possible outputs. And AI proved to be highly capable of finding correlations between elements it works on, that's how LLMs work.
I am not following literature, but I would be highly surprised if there are no papers on the subject.
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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by mistryous on April 29, 2025, 02:07:33 AM »This is really informative to me. Please more input like this - also if anyone else would like to join in go ahead.
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Generic Discussion / Re: Artifical Inteligence (AI) abilities and disabilities in chemistry
« Last post by tomkathy on April 29, 2025, 12:08:31 AM »Do you think AI can meaningfully contribute to experimental planning, or is it better suited for theoretical work and data mining?
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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by Borek on April 28, 2025, 02:32:57 PM »So are you saying that there are some substances that keep changing into acids as they only have contact with the (water in the) air? And the air should have a certain temperature then? What would be some examples for such substances and what temperature would be necessary?
For example most acid anhydrides work this way. Some are more sensitive to water and will react very fast, some will react slower, no simple answer tou your questions.
And acid anhydrides are definitely not the only substances that behave this way.
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Thioacetamide just in water would work? At room temperature? Or above 20°C?
In classical inorganic analysis thioacetamide is used in hot water bath to precipitate sulfides. It does react in low temperatures as well, but much slower (basic kinetics). It is highly possible other thioamides will decompose much easier at room temperature (but no, I can't give examples, this is just prediction based on how the chemistry works in general).
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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by mistryous on April 28, 2025, 02:15:29 PM »Wow, 2 possibilities that are completely new to me!
1.
So are you saying that there are some substances that keep changing into acids as they only have contact with the (water in the) air? And the air should have a certain temperature then? What would be some examples for such substances and what temperature would be necessary?
2. Thioacetamide just in water would work? At room temperature? Or above 20°C?
1.
So are you saying that there are some substances that keep changing into acids as they only have contact with the (water in the) air? And the air should have a certain temperature then? What would be some examples for such substances and what temperature would be necessary?
2. Thioacetamide just in water would work? At room temperature? Or above 20°C?
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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by Borek on April 28, 2025, 12:31:25 PM »Not that I have an exact proposition, but I would look for any sulfide mixed with some substance that slowly hydrolyzes producing an acid in the presence of water in air - such a mixture should produce H2S very slowly and for a long time (and you really need hydrogen sulfide in a very minute amounts, smell can detect some insanely low concentrations).
Or something similar to thioacetamide, which easily hydrolyzes in hot water, producing the gas. Just something that doesn't need elevated temperature. Or put it in a device similar to vapes, with a small battery run heater.
Or something similar to thioacetamide, which easily hydrolyzes in hot water, producing the gas. Just something that doesn't need elevated temperature. Or put it in a device similar to vapes, with a small battery run heater.
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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by mistryous on April 28, 2025, 12:10:01 PM »But then the odor won't last too long which is exactly the problem. How would you make it last longer over time so that you could use it for a smelling sample impression again and again, at least for a week or so?
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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by Hunter2 on April 28, 2025, 11:51:29 AM »Get ironsulfide FeS and add some acid (sulfuric, hydrochloric, acetic acid, etc.)
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Inorganic Chemistry Forum / Re: How do they make H2S sniffing sticks?
« Last post by mistryous on April 28, 2025, 11:14:16 AM »No, not the ammonia test, but H2S smelling test sticks. They use smelling sticks for training so you know how different gases smell. Also for all kinds of aromas, but H2S is not easy to get into a stick. It is very special because usually the smell is quickly gone. So how can you make it last in small concentrations? How can you conserve this odor for some time is the question.
