O-Chem Fractional Distillation with Dr. John Davison at Irvine Valley College, in Irvine, Ca. (Part 5 of 7) of the IVC Chemistry Lab Safety Series. (8,879 prior views)
Thank you Dr. Davison! This has been very valuable for me. I have had a difficult time being disciplined enough to continue college and so far I've been learning mostly online.
Whoa you are one awesome teacher and person!!!! You're like a teacher from the movies! Why can't my school have such cool teachers? Keep making videos, sir.
To Michael Marcello -- the numbers you saw on the receiving flask are actually 14/20 and they refer to the size of the ground glass joint on the flask.
okay, so I have 2 volatile substances and I am using fractional distillation to separate them. But my problem is reading the thermometer... like to know the correct boiling point. So when the thermometer rises and it stops is that the first unknown temperature?
It is the boiling point of the substance whose vapours are at that point passing at the thermometer bottom. It might be the boiling point of one of the substances, or it might be the boiling point of the mixture, depending on how sucessfull is your separation. You can only know that once you analyze the fractions later
Would the the little stems/outlets coming out of the vertical packed column need to be closed off? I assume they would. What would you use to close them? I need to get something to close mine off, but I am not sure what you would call those caps.
What about the first column, Sir, where the steel wall was inserted, the inlet and outlet nozzles are not plug close? Do we need another silicon hoses?
You do not need to cool the first column. That column needs to get hot so that the vapours don't cool down and condense prematurely, before they can get to the second column. That is why the professor isolated it with aluminum foil. In fact, this is the first time that I've seen someone using the typical condenser for this role, I am typically using a vigreux column for fractional distillation, but this would work as well, maybe even better.
No, you don't need to close the inlet and outlet connections on the vertical condenser. That condenser will have hot vapor inside the inner tube, and just ambient air inside the outer tube. You want a temperature differential along the vertical length of the column. Capping off the connections would do little either way to help that -- and they could cause a pressure build-up inside the outer tube so you caps might blow off! Dr. D.
You can theoretically calculate that with the vapor pressures of the pure liquids (see also clausius-clapeyron) but in reality many mixtures react differently. They often form azeotropes which complicates things... It is easiest to get those phase diagrams experimentally, that is quite easy. You can do that with many subsequent simple distillations of varying ratios and measuring the ratio of product mixture. It might take the better part of a day to get those diagrams, but it is not difficult Or you just hope they are already measured and you find them in a book or online
why aluminum foil i see this a lot. Rockwool i feel works better. Aluminum absorb heat but also dissipate heat very fast thinner the worst just. An input to this would be appreciated. love the video.
@@buckstarchaser2376 14 is the inner diameter at the top of a female joint, or the widest outer diameter at the male joint. 20 is the length of the joint. The angle is the same on all of them. Thus, all joints with the same first number are intercompatible, despite having different lengths. Thus, for example, 24/29 joint common in Europe is compatible with 24/40 joint common in US and China
Im jealous of his students... I wish I had a professor this enthusiastic about his field teaching me chemistry. They can learn a lot from him.
Thank you Dr. Davison! This has been very valuable for me. I have had a difficult time being disciplined enough to continue college and so far I've been learning mostly online.
Whoa you are one awesome teacher and person!!!! You're like a teacher from the movies! Why can't my school have such cool teachers? Keep making videos, sir.
thank you! this was very informative (for a newbie like me at any rate)
Very informative, thank you for posting
this Dr. is awesome
To Michael Marcello -- the numbers you saw on the receiving flask are actually 14/20 and they refer to the size of the ground glass joint on the flask.
"Joint." Gotcha.
Best Professor of all times!
Meticulous and informative video. Thanks for the upload
very thorough thanks!
AWESOME!! Very clear instructions.
yup i'm too agree
Awesome video
thanks. it helps me a lot.
awesome video
You are awesome helping me make distillate from cannabis, thank you sir and many others :)
Have you done this with cannabis? Does it works?
Is fractional distillation can be done under vaccum .or reduced pressure
Good video. Good job
respect !!!
Legend
Nice!
amazing video!! made it clear
you are amazing Dr. ive watched some of your videos for my ochem lab claas
okay, so I have 2 volatile substances and I am using fractional distillation to separate them. But my problem is reading the thermometer... like to know the correct boiling point. So when the thermometer rises and it stops is that the first unknown temperature?
It is the boiling point of the substance whose vapours are at that point passing at the thermometer bottom. It might be the boiling point of one of the substances, or it might be the boiling point of the mixture, depending on how sucessfull is your separation. You can only know that once you analyze the fractions later
Would the the little stems/outlets coming out of the vertical packed column need to be closed off? I assume they would. What would you use to close them? I need to get something to close mine off, but I am not sure what you would call those caps.
EffumGood I'm glad you asked
how high is this guy!! WOW
How this diagram would fit for a mixture of Ethanol / water ... will it be the same or there will be deviation to Raolts law,,, Thnks prof
How to separate by distillation THC from CBD ? Is that possible or not ?
Absolutely doable 😊
Love that intro music man 👍😊
Dr. Davidson is a G
What about the first column, Sir, where the steel wall was inserted, the inlet and outlet nozzles are not plug close? Do we need another silicon hoses?
You don't need to close these nozzles
I mean another cooling system. Hose to the inlet and outlet?
You do not need to cool the first column. That column needs to get hot so that the vapours don't cool down and condense prematurely, before they can get to the second column. That is why the professor isolated it with aluminum foil. In fact, this is the first time that I've seen someone using the typical condenser for this role, I am typically using a vigreux column for fractional distillation, but this would work as well, maybe even better.
Thanks for video keep going 🤠 greeting from Morocco*
even i could understand this easily ....sweet
SO helpful! I understand it now
what do you think about it ?
Sangita Rajole bro. You replied to someone’s almost 7 year old comment. Humans don’t converse on those timeframes.
We could if you want tho 😂
Jennifer Corcoran this reply made my day. :).
Thank you Dr. Davison with the steel wool hair lol.
No, you don't need to close the inlet and outlet connections on the vertical condenser. That condenser will have hot vapor inside the inner tube, and just ambient air inside the outer tube. You want a temperature differential along the vertical length of the column. Capping off the connections would do little either way to help that -- and they could cause a pressure build-up inside the outer tube so you caps might blow off! Dr. D.
John Davison I'm glad you answered
How did u know the vapor precentage?
You can theoretically calculate that with the vapor pressures of the pure liquids (see also clausius-clapeyron) but in reality many mixtures react differently. They often form azeotropes which complicates things... It is easiest to get those phase diagrams experimentally, that is quite easy. You can do that with many subsequent simple distillations of varying ratios and measuring the ratio of product mixture. It might take the better part of a day to get those diagrams, but it is not difficult
Or you just hope they are already measured and you find them in a book or online
Some chemistry class would help. Watch professor again.
my man
why aluminum foil i see this a lot. Rockwool i feel works better. Aluminum absorb heat but also dissipate heat very fast thinner the worst just. An input to this would be appreciated. love the video.
It should not isolate too much. You need the temperature gradient to get separation of the mixture. Aluminium foil is a good middle way.
Adorable video John - but its ALUMINIUM! :D X
Bev Harris \
Yoy are great
I have never seen a fractional distillation that small before. lol
hehehe "I don't want it to tip over when the great earthquake comes!"
Truly
Damn, I love organic chemistry....
Chung is still looking for you !!! HA HA HA HA HA !!! HA !
receiving flask says 420 lol
I caught that, too
The connection is labeled 14/20, indicating the size and angle of the connection.
@@buckstarchaser2376 Actually, it is the longest inner diameter and length of the joint. They all use the same standard angle
@@milospavlovic4599 Um, actually...
@@buckstarchaser2376 14 is the inner diameter at the top of a female joint, or the widest outer diameter at the male joint. 20 is the length of the joint. The angle is the same on all of them. Thus, all joints with the same first number are intercompatible, despite having different lengths. Thus, for example, 24/29 joint common in Europe is compatible with 24/40 joint common in US and China
Natrium Nickel
Toluene, as in TNT 🧨? lol 😂.
TNT is trinitrotoluene, a different compound, though related.
A.C. Patterson “tell me something I don’t know, ahole”
Using aluminum foil, lol how ghetto 😆👍