So I’ve been trying to clean this old flask that must’ve had candle wax or something in it once. Nothing has worked so I put acetone in and left it overnight. I came out this afternoon to acetone boiling. At least I think that’s what’s happening here. It seems pretty cool and I thought maybe some people might find interesting if I shared it here. Thanks:)
There are some beakers that I want to clean. They have contained water for a long time. That’s why I think glass corrosion has happened to them. You can see white deposits have formed on the inner walls. I have tried to clean them with detergents and some abrasives but couldn’t remove them completely. I am considering to use an acid such as HCl to dissolve the deposits. Is this a good choice? Do you have any suggestion? If possible, I would appreciate quantitative suggestions, such as the appropriate acid concentration and cleaning procedure. Thank you.
So I’m kinda curious why after spilling HCl—specifically muriatic acid, so idk if that has anything to do with it since it’s impure—on my hand doesn’t hurt. I even left it there for like 15 seconds out of bewilderment that it just didn’t hurt at all. It did fume for a sec—and the fumes HURT, ouchie my lungs—but other than that it was fine. I washed it off and used baking soda and all that jazz so it should be fine now but I’m still curious.
Is it because of the layer of dead skin?
Is it because it’s muriatic acid?
Im genuinely curious as to why it didn’t hurt.
This was identified from a sample taken off of brown corium seen in IMG. 2 and 3.
I know that you can observe differences in some parameters between groundwater and surface water. For example, groundwater often has higher TDS or EC values. But is there any definitive method to distinguish between them? Suppose someone brings me two water samples. Can I determine through chemical analysis whether one of them is groundwater? Or can I identify which sample is from groundwater and which is from surface water? Suppose that you don't even know if there is any groundwater sample between these two samples.
The 2024 paper Chemical Bonding and the Role of Node-Induced Electron Confinement appears to argue that, as atoms approach one another, chemical bonding is governed by an increase in the kinetic energy of the electrons caused by one or maybe more of the following mechanisms:
Is it reasonable to say that most chemists would consider these three mechanisms sufficient to explain the formation of chemical bonds?
I've seen a few threads here on this, but still have questions...the maintenance guy in our building dropped two burned out long fluorescent light bulbs in our kitchen right next to our gas stove and the powder and glass flew EVERYWHERE. I was actually in another room and glass flew at me. He swept it up and then asked me to vacuum the shards. I've been cleaning counters and in our dish cabinets and food cabinets for days and am still finding glass shards. I read vacuuming is the worst thing you can do when these bulbs break because of mercury. I then proceeded (because I knew nothing about these types of lights) to vacuum the rest of the apartment with the same vacuum I vacuumed the powder off the kitchen floor with. And we were going to have our carpets cleaned two days later. Google is telling me the vacuum must be disposed of and the mercury will last forever in our carpet. That we can't vacuum for two weeks. Someone with knowledge of this stuff, please help me understand the facts. Google has extreme answers and I don't know anyone familiar with chemistry. Please excuse my ignorance!
Online I’ve seen these from $18.95 to $200.00 and they are borosilicate glass and almost identical to each other so my question is if I buy a cheap one will I regret it later?
Hello!
I apologize if this is the incorrect sub to ask, but I didn’t see anything in the rules forbidding equipment questions.
I am looking for a decent 1000-mL 24/40 ground glass filter flask that has the air port on the actual flask itself, rather than on the funnel.
This one is pretty much exactly what I’m looking for, however I’m looking to keep it in the range of $25-30. If this is not a reasonable price point, please do let me know.
I wouldn’t be pulling a strong vacuum on it, however I would prefer one that has a bit thicker glass than some of the cheap flasks I have seen.
Thanks!
Tl;dr - Please recommend me a vac flask with a 24/40 ground joint around $25-30. No filter funnel is needed.
This is my biggest docking screen so far: roughly 700 million ZINC22 Carte Blanche compounds against the NBOMe-bound 5-HT2A receptor structure.
The point is not specifically to find NBOMe-like compounds. I’m using that structure because I don’t want to prematurely exclude larger 5-HT2A agonist chemotypes that might not fit well in a more compact receptor conformation.
This screenshot is just one machine’s output. I have 6 computers running in parallel, with each machine handling roughly 150 million ligands. Each chunk is about 500,000 ligands, so having this stage automated has been incredibly helpful. Otherwise, tracking, submitting, monitoring, and rerunning failed chunks at this scale would be painful.
Each machine is running a Ryzen 9 5950X, 128 GB RAM, and a 2 TB NVMe SSD. They also have RTX 3060 Ti GPUs, although for this workflow the GPU is basically unnecessary because the CPU is doing the docking work.
The machine shown here is at about 81% complete by PV chunks, with about 110.5 million ligands completed out of an estimated 135.9 million for this node.
This run started May 30, 2026, has been running for about 34.5 days, and this machine is projected to finish around July 12, so roughly 42–43 days total for this node.
Which is more accurate for measuring liquid volumes, a student grade graduated cylinder (Karter) or a cheap digital scale? 1 ml water weighs 1 gram, easy conversion.
I just finished my first year of my bachelor's degree in chemistry. Throughout my inorganic chemistry labs, I took photos, printed them, and put them together into a visual journal. It became a nice way to remember the experiments and how much I've learned throughout the year)
Has anyone else done something similar?
I'm thinking about digitizing it and then doing something with it in the future. What do you think?
There will definitely be more pages - next semester is all about transition metal chemistry 😊
Hi all,
I live in the Netherlands and I'm looking to start doing some science like distillation chemistry and other reactions for fun. For example, i'm thinking about distilling an eau de cologne to an eau de parfum for a friend of mine, by distilling out the diluting alcohol.
As i'm a science student, first year, i do not have a lot of money. (and i don't work😅 because of the very busy study and other reasons). I heard that a lot of people have science stuff without doing anything with it because they have better stuff or they stopped doing things with chemistry. So i was wondering if people had stuff i could have/use?
If not, thats also okay ofcourse, i hope im not breaking any rules by asking this.
I look forward to hearing of you all.
Hey y'all!
A little bit of a chemistry newbie here, I'm interested in synthesizing some CuCl2, which I did today through the combination of hydrochloric acid, hydrogen peroxide, and copper metal, however I'm unsure of the process to precipitate the CuCl2 out as a solid, I'm a little scared of boiling it because of the fumes, is there any better way? Also, if I have excess solution, how do I neutralize it for disposal? I tried using NaOH but it just created some weird copper compound sludge. Any help would be greatly appreciated!
Hi, I was wondering if anyone here was working with or was interested in High Enthropy Alloys/Oxides. I came across the idea and was wondering of its applications and if it is worth the trouble to synthesize (economically speaking for anything it might be used). My understanding of it is that we put a bucketload of cations in a confined space which creates a lot of electron sharing, vacancies etc. that can make for a decently reactive actuve centres catalysts and whatnot. I was just wondering what you would have to say. If this is a type of question I shouldn't ask here - let me know (because I suppose I could just spend more time on wikipedia, but I'm just curious about it coming from chemists).
Hi guys!
This is a follow up to my post from earlier this week. You guys gave me some great suggestions, so I made some new f orbital designs! I thought this sub might appreciate them!
These are the designs that I have so far and I'm hoping to make some more soon.
These are *hand drawn*. I did not use AI to generate the designs. I did use AI for the typography, though.
I do sell these as posters/mugs/etc., so here is the shop link for anyone interested.
https://www.etsy.com/pt/shop/WildformSupply?ref=shop_sugg_market
Do you have a favorite? Least favorite? Let me know. I would love any feedback!
First sensitized it using chromic acid + HF, then seeded it using Palladium nanoparticle colloid which serves as catalyst, and electroless plated using alkaline borohydride based electroless copper, achieved a uniform thickness if 6 micron in 3 hours