I had 2 lab courses simultaneously during 2 semesters of covid. We just had to put on a mask and get to it. Was horrible, couldn't see anything with the protective glasses fogging up haha
Oke this explains things very well and is very educative but for the love of all that's holy, please stop blasting that alarm audio, my poor ears.. It would also be appreciated if a reupload of this video with higher video resolution were released.
Possible with any method, especially reverse additions. One possible cause of oiling out is that drops of the product solution are surrounded by the antisolvent, in which the solubility is very low, and this low solubility creates localized regions with very high supersaturation ratios. Many variables to consider here. Before mixing to the molecular level is achieved, the localized high supersaturation forces the product out of solution without allowing sufficient time for ordering of molecules to enable crystal development. The resulting oily particles have a tendency to clump together before the Occluded solvent migrates throughout the solution. As the mixture is aged, the oiled-out particles may transform into amorphous solids or become "crystalline" (with poor lattice structure)
You want all of the compound to dissolve in the solvent (= no crystals) at the point where the solvent would start to boil. But when you cool down the solvent the solubility decreases which leads to forming of compound crystals. When solution has cooled to room temperature you want all of your initial compound to be as crystals, and not dissolved in the solvent, for a maximum yield. Only the impurities should be dissolved in the solvent at room temperature.
chunkymonkey2782 If I understand correctly, oiling happens when the boiling point of the solvent exceed the melting point of the sample. So when sample is dissolve at boiling point of the solvent, the solution created would have the sample "oiled" out instead of crystallize out. If this happen, you should reselect your solvent...
Question : in the case of two solvent, what is the problem if I do first hot filteration for more purification if there are insoluble impurities suspended with my new copmound?
This is very useful in pandemic times, because we aren't allowed to go to the laboratories! thank you :D
I had 2 lab courses simultaneously during 2 semesters of covid. We just had to put on a mask and get to it. Was horrible, couldn't see anything with the protective glasses fogging up haha
Anyone else here because of ochem class? XD
me lol
Yes, and corona lol
yup, even 3 years later lol
I would assume that to be the case, in general.
anyone doing organic chem assignments for pearson mastering chemistry? email me at allen.amani97@gmail.com (incentive provided)
Open transcript >> toggle timestamp >> copy & paste to Word >> ctrl + F keywords >> done with ochem worksheet
Learning ,it’s very educative and resourceful. As Virginia Union University student I recommend this for you too
Thanos: Post the video
his man: But sire! the quality
Thanos: I said do it
Excelent video on recrystallization.
don't forget to remove those boiling chips you added before allowing it to cool.
Thank you Mit , THANKS .
THUMBS UP---IF you enjoyed the music accompanying the recrystallization.
yesss
Great audio
do you know whose composer is the music at 10:57 from?
@@pedronuno8892 ua-cam.com/video/uMYCETzznCo/v-deo.html
@@rainlover1964 thanks, but I found it already :)
Oke this explains things very well and is very educative but for the love of all that's holy, please stop blasting that alarm audio, my poor ears..
It would also be appreciated if a reupload of this video with higher video resolution were released.
Có ai ở đây vì môn practice organic không?
Choco bisettes
Ah ouais carrement
Ah oui mange moi la gestion
can someone explain more in depth why oiling out happens and what to do if it happens?
Possible with any method, especially reverse additions. One possible cause of oiling out is that drops of the product solution are surrounded by the antisolvent, in which the solubility is very low, and this low solubility creates localized regions with very high supersaturation ratios. Many variables to consider here. Before mixing to the molecular level is achieved, the localized high supersaturation forces the product out of solution without allowing sufficient time for ordering of molecules to enable crystal development. The resulting oily particles have a tendency to clump together before the Occluded solvent migrates throughout the solution. As the mixture is aged, the oiled-out particles may transform into amorphous solids or become "crystalline" (with poor lattice structure)
Why is it that the ideal solvent is insoluble in room temperature but soluble with the sample at boiling point?
You want all of the compound to dissolve in the solvent (= no crystals) at the point where the solvent would start to boil. But when you cool down the solvent the solubility decreases which leads to forming of compound crystals. When solution has cooled to room temperature you want all of your initial compound to be as crystals, and not dissolved in the solvent, for a maximum yield. Only the impurities should be dissolved in the solvent at room temperature.
Henry law and roult law
chunkymonkey2782 If I understand correctly, oiling happens when the boiling point of the solvent exceed the melting point of the sample. So when sample is dissolve at boiling point of the solvent, the solution created would have the sample "oiled" out instead of crystallize out.
If this happen, you should reselect your solvent...
Good luck
why are they talking in caps tho
This is Chemistry, I got in the wrong line of work. Is it to late to go back and will ths Instructor give me an add code for her class
Question : in the case of two solvent, what is the problem if I do first hot filteration for more purification if there are insoluble impurities suspended with my new copmound?
como lo cambio al español?? ayuda porfavor
yogh is not Z
Okay
Im here because I’m a stoner and want to perfect my THCA crystallization tech 🤷♂️🤣
Thanks MIT, screw SDSU
Thought this was how to make terp sauce...
i only say.. metaaaaa
dank memes
Y'all couldn't get a real actor>