Gravity Filtration and Vacuum Filtration
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- čas přidán 18. 09. 2022
- The first laboratory technique that we will learn together is a very simple one, filtration. This is how we separate a mixture of liquids and solids. There are two common ways a chemist will perform filtration, those being gravity filtration and vacuum filtration. These are very easy to understand and perform, but there are some tricks involving the setup and execution that one must understand in order to be successful with them. Let's go through these techniques together now!
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I would add something about vacuum filtration. Either use gravity filtration or a very weak vacuum if your desired product has delicate crystals. Example: making metallic aerogel blocks
I I thought Arrow gel to use a jelly not crystals until later
@@borttorbbq2556 I'm not exactly sure what you're talking about in all honesty. But in metal aerogel synthesis, particularly for battery electrodes, you want a gentle vacuum to remove the hexane solution, and also gently add methanol to dissolve any salts that are in the aerogel, particularly if it's a mixed aerogel like iron + copper or tungsten + molybdenum. You have to keep the vacuum power low so that the metal aerogel doesn't collapse in on itself, if your ideal product is a tablet. If it's okay to have a metal aerogel powder for your needs, then it's okay, ramp the vacuum.
It should be noted that this whole process must take place in an anhydrous and anaerobic environment.
@@me0101001000 okay you're talking about after it is formed. Yeah I wasn't sure if you meant it before you know it's properly hardened or after it was hardened because I know before it's hardened basically an aerated gel and once it's hardened it's different it's a weird crystalline foam so I wasn't sure which timing you were talking about but that makes a lot more sense it being after being made
@@me0101001000 I have no idea what both of you are talking about lol. This is for beginners, so idkwtf metallic aerogels have to do with this simple introduction
@@dayhaysuper3639 it's just an example. When you make metallic aerogels, you put on a gentle vacuum to help pull the solvent out. There's a paper on the process of making iron-copper nanoporous mixtures which illustrate the process clearly, if you wanted to see what I was talking about firsthand.
Your channel is amazing, you have a video on everything I need 🙏
I love you Dave! You have been an indescribably amazing help in my journey to become a biochemist or potentially biologist. I love science in ever form, and it all excites me, and I'm not entirely sure what I want to progress to and your tutorials on nearly all fields help me gain a grasp on all of them. It's all so awesome but I have to make a decision soon because I return to college soon.
Also how is everyone not just blown away by the existence of the natural world and the fact that we know so much (and simultaneous next to nothing) about it.
Even thought chemistry isnt my favorite science, you make it interesting. I would love for every teacher to be like you!
Thank you professor
Thanks professor ❤
Hi, Dave. This will be a fun series. Just curious though, what compound is your friend separating?
Thanks Professor Dave!
Could you speak various types of spectroscopy such as IR UV vis and spectrometry such as MS NMR ICP?
This is actually a topic I learned about the other day, perfect timing for this video. I don’t know why but I’m always seeing vids about topics after I learn them. Just yesterday I learned about the MPLA from school, got on CZcams and seen a video about Bo2’s MPLA mission
It's because an algorithm recognized it in some way. Don't chalk it up to coincidence.
@@aleste3812 I think the MPLA one is a coincidence. I don’t think CZcams and my schooling site has a connected algorithm
@@Rryan8065 you'd be surprised. Many schools and education ebook suites allow data to be collected by google and the like. I'm not saying it can't be a coincidence.. But if I were a betting man, I'd wager it's not.
EDIT: also wanted to add that if you don't properly protect yourself on your computer it's very easy for cross site traffic to be tracked, so even if the school isn't explicitly allowing it, you could be unwittingly feeding the algorithm anyway.
If the algorithm realizes you're interested in something it'll show you more of that thing you would be amazed at how much religious and chemistry equipment I get just because I watch videos that involve those. But what's needs to be more scary and a little more disconcertainty about it is the fact that you can talk about it and not even search it and your phone will pick it up I have a friend who's learning Spanish and I get Spanish ads all the time because I spend a lot of time with her when she's practicing
Ignore and report the above comment from the Dave impersonator.
animated videos are really so good
It was really very nice
Thanks, Dave! I'd not done vacuum filtration at school.
I would imagine a funnel with a longer end protruding past the vacuum intake would prevent the vacuum from sucking up the filtrate. Seems like an important step.
Is there a specific lab kit that we can use to follow and perform along with the videos?
Could you do a video on soxhlet apparatus extracting
So far I've only performed vacuum filtrations using a faucet, and in these cases we're always taught to, when we're done, first pull the hose out, and close the faucet only after that. Otherwise, some liquid might flow back to the flask due to the change in pressure.
I'm not sure that's also the case with the device being shown here.
We always used to have a second flask in the vacuum line - this acted as a trap in case of "suck back" or overflow of the solvent into the pump (especially if you're using a mechanical pump - they don't like water inside!).
I'm a bit surprised that water pumps are still used - lots of waste water and possible contamination problems...
could you please tell me the mixture that you tried in filtering in this video? the one in the vacuum filtration experiment part
Thank you Why use a Buchner instead of a sintered sand core funnel with a thick porous filter?
thanks
Thanks
These were incredibly helpful for the National Chemistry Olympiad.
Wow. TF sponsorship! You really made it!
I am very happy that you are being sponsored by the big manufacturers, which is a direct acknowledgement of your work.
shoutout to the dude that demonstrates the experiments
yep, been there, done that, gone big. IOW, i've worked with all kinds of filters, from laboratory scale as shown in the video to industrial filter presses, several meters long with dozens of big frames that are pressed together hydraulically.
NICE !!!
Filtração simples
usada para separar misturas heterogêneas sólido+líquido
usa a força gravitacional para remover as impurezas, queremos isolar (obter) o líquido filtrado
passo a passo:
dobramos o papel de filtro (podendo dubrá-lo em 1/4 ou 1/8, sendo o 1/8 uma técnica maia rápida)
colocamos a argola no suporte universal e nela colocamos o filtro. Dentro do vidro, colocamos o papel de filtro, o qual molhamos com o mesmo líquido solvente da mistura para que ele adira ao vidro, sem deixar pontos secos ou bolhas
garantimos que a mistura está "bem misturada" e despejamos ela lentamente no filtro
notas:
não tenha pressa! a mistura não pode passar da altura do papel de filtro, pois pode contaminar o líquido filtrado
deixe o funil próximo do frasco coletor e com sua ponta tocando as paredes internas do recipiente (para que o líquido filtrado não goteje)
para garantir que toda mistura foi separada, lavamos o recipiente em que estava a mistura com o solvente dela, para extrair os restos de soluto
Filtração à Vácuo
destinada para grandes volumes de mistura, por ser mais rápida
obtenção do sólido (e também do liquido, mas o sólido é o principal)
usamos um kitassato conectado à uma bomba à vácuo, pois a pressão causada pela remoção do ar
puxa o líquido através do filtro, acelerando o processo
usamos também um funil de buchner, o qual cobrimos com um papel de filtro (que deve ter exatamente o tamanho do funil, sem sobrar nem deixar de cobrir os buraquinhos)
aperte o funil contra o kitassato para garantir a pressão adequada
para que o papel adira ao funil, molhe-o com o solvente da mistura
teste o funcionamento do sistema
despeje sua mistura no filtro
deixe a bomba ligada por um tempinho para "secar" o sólido obtido
remova o papel de filtro com uma pinça
notas:
não deixe o vácuo muito intenso, isso pode rasgar o papel de filtro e resultar em contaminação
não faça com que o líquido no kitassato atinja a parte em que o frasco é conectado com a bomba, ou o líquido será sugado pela máquina
Don't suppose you would ever do a video on Ketamine? It has been a life saving treatment for me, would be nice to know more about it.
It could make its way into the history of drugs series, or pharmacology maybe.
Apparently ketamine was derived from PCP. How wild is that?
@@eatshitlarrypage.3319 Wow, that is crazy, I had no idea!
This guy knows a lot about the science stuff
All kinds of stuff!
What is that machine called?
Hello, Dave. Just an FYI, there's a channel that is impersonating you. Has your exact same profile picture and is reposting some of your videos but trying to make you out to be incorrect.
Darnit. Can you post the link to the channel here? I will report them for impersonation.
@@ProfessorDaveExplains Of course. I reported them as well.
Posted.
@@ProfessorDaveExplains czcams.com/channels/4R_lgKsZ09qx23qo67Is7g.html
@@DeltaH-9 is it that "telegram me..." guy? i'm reporting him too.
How do people wash the flask to ensure it’s totally clean for next use? It would be quite contaminated if we can’t wash it and reuse it
We wash glassware with soap and water .
@@ProfessorDaveExplains is there any checks done to ensure the soap and any particles in the water is not remained inside?
@@CyberMew That depends on the level of cleanliness your experiment needs. For the vast majority of all cases, you can rinse out the flask's volume three times with clean water. Let's say when you dump out a 1000 mL flask down the sink, and there's still about 10 mL's of soapy water clinging to the sides that you can't get out. Well when you fill that up with the first volume, you've diluted that soapy water 100 times (10 mL soapy water in 990 mL clean water). Then you dump that out again, with 10 mL remaining. Fill it up again, you've diluted that 100 times. Do it a third time. By now the little bit of soapiness after your wash has been diluted 1,000,000 times. So that's clean enough that it won't interfere with just about anything. That said, there are a few ultrasensitive measurements where it could, so you'll need a better cleaning protocol, but that would usually just involve many more washings with clean solvent.
@@CyberMew it depends on the experiment with most experiments the little bit of residue from water and soaked typically won't be enough to actually mess anything up but there are very sensitive experiments that would require basically perfectly clean and usually with those you'll have specialized equipment for that like Sonic cleaners which if I understand correctly use a special solution and vibration to pretty much perfectly clean everything and then from there you can just set it on a rack let it dry and it's good you may need a rinse it with some distilled water or ro water. Again just depends on how much Purity is necessary RO water is pretty much as pure as you can get without going through distillation processes
@Critical Scientific Thinking These are lab techniques, where cleaning is always approximative, and soap and water, perhaps followed by acetone, are enough. Industrial cleaning is a totally different topic, as you explained, requiring analytical controls and some level of validation.
They literally engineered the hemp doctor for me as street psychiatry! That's hilarious!
Lol the solvents coming out of the pump
Sometimes a gravity filtration can be done using a cotton plug
I love your videos. Especially when you take on your flat Earthers. What you do is important. Thanks. 😊
Gravity AND Vacuum mentioned in the same video? Oh boy. Flerfs aren't going to like this. 🤣😝
I was actually thinking their going to love it and probably do some nonsensical video trying to debunk it using magnets 🤣
@@conormcardle3350 Or claim it is 'relative density disequilibrium, not grvity' 🤣😝
@@diverdannavyvet9672 if you ever see someone trying to argue that all you have to do is ask what dictates the direction of the sinking or loading
Are there going to be any more Discovery institute videos?
Part 3 on Friday!
@@ProfessorDaveExplains Super excited!
@@ProfessorDaveExplains oh sweet I was looking forward to that.
@@ProfessorDaveExplains My week just got a whole lot better.
I know it's not really your thing but I'd love to see you do a video on climate change
Ecology content is coming soon!
Everywhere in my lab, I see "fisher" (the is not an endorsement)
At 3:12 "This maximizes the surface tension of the filter" Really? I would have guessed it would be surface area of the filter that would be maximized with this folding technique, making the liquid go through much faster.
The science of coffee 👩🔬 ☕️ 😎 excellent
Really a missed opportunity to have chemistry youtubers do these demos. Probably not as professional looking though.
Nile Red's lab looks pretty professional to me. Though what goes on in that lab... not so much. I say that as a fan of his
professor michael morbius explains
Dave. Unrelated comment, but could I please discuss something with you, on a call?
"Gravity is just a theory!"
Absolutely love hearing people say that. Tells me instantly that they don't understand the use of that word in science.
Hahaha just did this in my lab on Thursday we were getting 9-fluorenol from 9-fluorenone
The hemp doctor made me poop so good!
Gud video
Not buoyancy and density filtration? How about energy of the heavens filtration?
Silly Billy.
Speaking of coffee ... I'll be right back!
Sir i am from india have done something called systumm hiladiye
People do good science every morning when they make coffee and don't even realize it.
I mean you're not wrong. I mean to do a good pour over you know you need a precise temperature of water you need a precise grind the coffee and when it comes to filtration if all of these factors are not correct it can either take a very very long time to make your coffee or it just runs through and you basically end up with Bean water. But his description of how to do gravity filtration is exactly how you do a proper pour over you bring it up to being just a little hello rim and then you let it mostly filter through and then you top it up as you go you don't let it fully filter through until you're done otherwise you're going to run into problems but you also want to be careful as no one wants ground in their coffee. No if you're using an electric machine then you know you're cheating but essentially it's doing all of that for you except for the grind that one you still need to select one and Electric machines actually use a different Grind from Standard Pour overs
👍
Thats just like all the tutorials you get when by searching
But without all the annoying speaking pauses that makes you wanna have the video on 1,25 speed
5th 🎉
Ok nerds
Anyone from CHEM 235?
me 2nd
Fuck yeah bitch les go
A few days after a friendly argument with my sister on this very topic🤌🏾