Invivochem or Probechem
/r/Chempros/comments/1un88gr/invivochem_or_probechem/
https://redd.it/1un8910
@r_chemistry
Largest virtual screen I’ve run so far: ~700M ZINC22 compounds against serotonin 5-HT2A
https://redd.it/1un1i9q
@r_chemistry
What information do you want to see before buying a research compound?
If a product page only allowed a few pieces of information, what would be essential for you?
For me:
Purity results
Identity confirmation
Batch number
Independent testing source
What else would make you feel confident in the material you're ordering?
https://redd.it/1umzacd
@r_chemistry
Part 2 ---> I got sick of generic chemistry art so I made my own
https://redd.it/1ums845
@r_chemistry
Castner cell vs downs cell
Hello I’m newer to electro chemistry, and very interested in the engineering and design of sodium production cells. As I understand castner would split NaOH in to water and sodium; some of which will red dissolve into the solution. And due to the point of which water will build up and can cause explosions, would it be worth just replacing instead of designing a system for” purging” ? A down cell downside is producing chlorine gas, from NaCl. Which would be better, or better ideas for more metal synthesis through electro chemistry.
https://redd.it/1umoty5
@r_chemistry
Metallized this non conductive epoxy fiberglass sheet with palldium catalyst based electroless copper
https://redd.it/1ume2pg
@r_chemistry
What's your favorite oxidizers and reducers?
Mine are:
Oxidizers:
1.peroxysulfates: very useful in industrial electronics and waste management
2.Peroxide: kinda mid but is very versatile and can be converted to metal or organic peroxides
3.Permanganate: another industrial powerhouse and versatile oxidizer
4.Cr6: toxic hazard, yes, but one of the most powerful and useful tool in conversion coatings and sensitization of non conductive surfaces for catalyst seeding for metal plating
5. Nitric acid: obviously
Reducers:
1. Sodium Borohydride: one of my favorites due to it's niche uses in my work but very, very elegant
2.LiAlH4: obviously, the king of reducers, but too unstable
3.Hydrazine: If it wasn't for it's hazardous nature, it was a very, very useful reducer
4.Sulfite/bisulfite: weak but very useful in industrial forumulations
5.Formaldehyde: pretty decent in alkaline conditions
6.Hypophosphite/hydroxylamine: reducers that work in acidic conditions
Now tell me your favourites
https://redd.it/1um59nd
@r_chemistry
Notable Antique Textbook?
https://redd.it/1ulzdyp
@r_chemistry
GFAAS Cadmium Analysis in Food – One Calibration Curve for All Matrices?
Hi everyone,
I’m working with GFAAS for cadmium analysis in food matrices, and I wanted to ask about calibration strategy.
Do you usually use one calibration curve for all matrices (vegetables, fruits, fish, etc.), or do you prepare different working ranges depending on the matrix and its MRL?
For example:
Fruits & vegetables: Cd MRL around 0.020 mg/kg
Fish: higher MRLs, often around 0.050–0.100 mg/kg or more depending on species
Since the working range should ideally cover the regulatory limit, I’m wondering what calibration range you find most practical and reliable for routine analysis.
I’d appreciate hearing how you set up your calibration ranges and whether you use separate curves for low- and high-level matrices.
https://redd.it/1ulvfar
@r_chemistry
i want to learn again in chemistry
I graduated in Bachelor of Secondary Education in Science last 2022 and after I graduate I instantly apply to corporate jobs and i forgot all of my learnings in college specially in chemistry and physics. What would you recommend or advice to start again in learning in chemistry? I just resigned to my job and I am looking for a job which involved in teaching again. I am familiar to other topic but I need a tribal learning again T_T tyia
https://redd.it/1ulqn1c
@r_chemistry
My grandfather gave me these books :o
https://redd.it/1uln2hz
@r_chemistry
Why do uk schools teach you a different periodic table?
Hi, I went to school many years ago in England and I always remember using the periodic table with 8 groups however looking at periodic table designs they always have like 18 groups, why do students in England get taught a different periodic table? I can’t remember but is does the group number in the 8 group periodic table it is something to do with the amount of electrons in the outer shell?
https://redd.it/1ulj4wg
@r_chemistry
What are you all working on right now?
Currently I'm doing a chromic acid + HF based sensitization for epoxy-fiberglass sheet for palladium seeding based copper metallizion for electronics purpose
https://redd.it/1uldb7c
@r_chemistry
because it is the only one that is structured and documented with measurements and everything (Lavoisier and the scientific community of this very subreddit would probably kill me if I published something as poorly structured and improvised as all of my previous attempts). In conclusion, I can say that this process is indeed suitable for obtaining this salt, at least until I manage to get better laboratory equipment than 10 borosilicate test tubes (certified by Francisco H. Walz S.C.A.) and household items.
**Final words:**
I would absolutely love to receive feedback. I am willing to listen to all your criticism and comments. It has already been a year since I decided that I would dedicate my life to chemistry. Although I am still very far from earning a degree in chemistry, I have an indescribable passion inside me. Every video, everything I do, everything I see related to chemistry fills me with motivation. Every time I explain my experiments, I feel a fire inside me. Whenever I have been depressed or sad, I have turned to reading or spending time with chemistry, one of the few things that has never stopped exciting me or bringing me joy. I can spend an hour locked in my room, completely focused on analyzing my samples, simply because I enjoy it. I came to this subreddit with the mission of finding people who believe in me, and if not, then finding people who enjoy chemistry so I can talk outside an environment where no one understands a single word of what I am talking about. Finally, I would like to quote the words of Marie Curie herself, which perfectly represent a part of my life and the way I see science: "Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less."
https://redd.it/1ul667z
@r_chemistry
HEA
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).
https://redd.it/1un3m5y
@r_chemistry
Accurate volume measurement
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.
https://redd.it/1umyysi
@r_chemistry
Safe precipitation of copper (ii) chloride?
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!
https://redd.it/1umvlyj
@r_chemistry
Chemistry enthousiast :)
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.
https://redd.it/1umogax
@r_chemistry
Effect of hydration of thickener before emulsion and after emulsion
I was wondering. Using xanthan gum with just plain water would allow the gum to completely hydrate and after you could make an emulsion with it. How about adding the xanthan gum after making the emulsion. Since there is less readily available water, would the hydration of the xanthan gum be incomplete? Wouldn't that make it also less viscous ? Now, if we were to use a different branch of xanthan gum that has stronger polymeric interaction. Would that difference in effect be even greater? Would using NaOH (and later neutralize it) be able to reduce the hydration/polymeric interaction to have it normalized between the 4 different scenarios (before/after emulsion, xanthan gum/alternative)? If you have any ressources that could guide me, I'm all ears.
https://redd.it/1umgug9
@r_chemistry
Chemistry Journal
https://redd.it/1umdjhz
@r_chemistry
Books / learning tools for electrochemistry
Hi, I’m a 2nd year undergraduate in chemistry and my Uni isn’t so invested in electrochemistry. Are there books or methods that you great people recommend?
Most teachers are oriented in the organic field, but I simply think that I can learn most of the stuff in that domain by reading articles, + why memorize 1 million reaction types that won’t ever be usefull to me. I enjoy the principles of organic and inorganic chem, but I think that there is a great potential (joke aside) in electrochemistry for developping different devices based on my last intership. The problem is that I can’t truly get the hang of that subject compared to other chem related topics.
Thanks 🤗
https://redd.it/1um0bcj
@r_chemistry
What type of chemistry do you work on?
I work in coordination chemistry, catalysis
https://redd.it/1ulxun0
@r_chemistry
GFAAS Cadmium Analysis in Food – One Calibration Curve for All Matrices?
Hi everyone,
I’m working with GFAAS for cadmium analysis in food matrices, and I wanted to ask about calibration strategy.
Do you usually use one calibration curve for all matrices (vegetables, fruits, fish, etc.), or do you prepare different working ranges depending on the matrix and its MRL?
For example:
Fruits & vegetables: Cd MRL around 0.020 mg/kg
Fish: higher MRLs, often around 0.050–0.100 mg/kg or more depending on species
Since the working range should ideally cover the regulatory limit, I’m wondering what calibration range you find most practical and reliable for routine analysis.
I’d appreciate hearing how you set up your calibration ranges and whether you use separate curves for low- and high-level matrices.
https://redd.it/1ulvgfl
@r_chemistry
Seeing a crow in my polymer film feels like an omen...
https://redd.it/1ulrxbw
@r_chemistry
Disappointed because of my first undergrad research experience
This summer, I got my first-ever research internship. I'm a freshman, and I'm working in an inorganic chemistry lab. I was really excited to start, but lately I've been feeling disappointed in myself. My biggest struggle is understanding the theory behind what I'm doing. I think part of the reason is that I haven't taken inorganic chemistry yet (I'll be taking it next semester). I hoped that, over time, things would start to make more sense as I gained experience in the lab, but I'm still having a hard time understanding the concepts. Right now, I mostly follow the procedures my professor gives me, such as setting up reactions, without fully understanding why I'm doing each step. I've been trying to ask more questions and read the research papers multiple times, but I still feel stuck. I don't know how to analyze my results, evaluate what happened, or draw meaningful conclusions from my experiments. I've been in the lab for about a month, and I only have one month left. I really want to make the most of this opportunity. For those of you who have been in a similar position, what would you recommend? How can I get the most out of the rest of my internship?
https://redd.it/1ulondl
@r_chemistry
Does this resemble any kind of molecule? It’s a playground in Texas
https://redd.it/1ullalb
@r_chemistry
is drinking "pure water", like pure H2O without any external minerals or iron actually healthy for humans
https://redd.it/1ulit83
@r_chemistry
Writing
/r/WritersGroup/comments/1ulaei7/writing/
https://redd.it/1ulaizp
@r_chemistry
homemade synthesis of cupric hydroxide
**Introduction**
I am very young and my journey in chemistry is just beginning. Everything I know I have learned exclusively from books or my own research, but even so I have ventured to carry out several experiments in my own way.
In the past, one of my experiments was electrolysis using seawater. Since I used copper wires, the result was cloudy water which, after researching, I determined was Cu(OH)₂. Since it interested me, I kept trying until I obtained a method that allowed me to create it whenever I wanted.
**Observation**
As I was able to verify, electricity breaks the chemical bonds in water, forming bubbles of its elements, oxygen and hydrogen. But if the electrodes are copper wires and pencil leads are tied to their tips (essentially so that they do not interfere with the reaction, since I had previously contaminated it by using screws or nails. Also, copper by itself does not electrify the water), the electricity releases Copper(2+) ions that combine with hydroxide(-) ions to form the cupric hydroxide that I observe. Although I am fairly certain that the resulting solid (after evaporation) contains sodium chloride (used to increase the electrical conductivity of the water), and possibly copper oxychloride, because in previous versions of the experiment, the copper wire ended up with a kind of stain or salt that was somewhere between white, green, and light blue (in color). Furthermore, it is the logical outcome considering that sodium chloride would not pass up the opportunity to release chlorine.
**Problem**
The main problem is that forming it is not as simple as combining electricity + water + copper, because the water does not react very well. That is why I used sodium chloride (although sodium bicarbonate would probably be better because it does not produce the problems associated with copper oxychloride). The electrodes are now graphite pencil leads, since nails produced unwanted iron in the final solution. In the end I was able to solve it in order to produce what is, at least in part, cupric hydroxide.
**Hypothesis**
I already mentioned it before. As far as I know, when hydroxide (-) ions are released at the anode, they combine with the positive copper ions that are released and remain in the water. Afterwards, that newly formed copper salt remains suspended in the water, although it also contains portions of copper oxychloride (formed by the reaction of copper hydroxide with the negative chlorine released by table salt), as well as salt dissolved in the water.
**Experiment**
**Materials I used:**
* 9V battery (photo attached)
* 2 copper wires (3 wires twisted together in each one), one measuring 6.6 cm and the other 6.3 cm.
* 2 pencil leads, one measuring 1.2 cm and the other 1.3 cm.
* 25 g of sodium chloride, or table salt (approximately, because I'm not sure how accurate my scale is).
* Water (approximately 100 to 125 mL)
**Steps I followed:**
1- Pour all of the available salt into the water.
2- Stir until no salt is visible to the naked eye.
3- Insert the copper wires with the pencil leads tied to their tips.
4- Connect the other end of the wire, without the pencil lead, to the battery (the battery terminals).
5- Wait approximately 5 minutes or longer.
6- Heat it in a water bath long enough for all the water to evaporate.
7- Collect the resulting salt and store it.
**Personal notes:**
* The water is pale light blue with yellowish tones.
* The wires: • One only darkened on the portion that was submerged. • The other darkened at one specific point. • The one that does not appear to be darkened produced a green flame when placed in fire, but only when the flame reached the portion that had been submerged in the water. (The base copper did not do this; I tested it as well.)
*(All of this was carried out on 06/14/2026.)*
**Conclusions**
This is one of the experiments I have performed the most. I would say I have carried out at least 6 different attempts, or perhaps even more. I decided to publish this one
