Mass Separation: Crash Course Engineering #17
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Date: 2022-04-04
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Comments and reviews: 10
Logan
The liquid-liquid extraction sounded really simple and I had all of the materials required, so I tried a little demonstration.
Procedure: I mixed 1 fluid oz each of olive oil and bourbon (40% abv) in a skinny clear jar, stirring with a chopstick. (I picked these because they both have distinctive colors from each other and the water) I then poured in about 4 oz of water, 'rinsing' the oil/bourbon mixture, and mixed.
Observations: The oil and bourbon don't form a solution like dissolving sugar into water might, but they did form a pond-mud-brown emulsion that didn't seem to be in danger of separating out anytime soon, unlike a bottle of italian dressing. This might have been because the bourbon was only 40% abv, so the water it contained prevented complete mixing. After adding the plain water and mixing, the oil got brighter green and its globules began fusing together again and the water turned light brown.
Conclusion: Neat! Might try this again if I get a hold of some everclear. Here in Pennsylvania, you have to special order that stuff.
reply
The liquid-liquid extraction sounded really simple and I had all of the materials required, so I tried a little demonstration.
Procedure: I mixed 1 fluid oz each of olive oil and bourbon (40% abv) in a skinny clear jar, stirring with a chopstick. (I picked these because they both have distinctive colors from each other and the water) I then poured in about 4 oz of water, 'rinsing' the oil/bourbon mixture, and mixed.
Observations: The oil and bourbon don't form a solution like dissolving sugar into water might, but they did form a pond-mud-brown emulsion that didn't seem to be in danger of separating out anytime soon, unlike a bottle of italian dressing. This might have been because the bourbon was only 40% abv, so the water it contained prevented complete mixing. After adding the plain water and mixing, the oil got brighter green and its globules began fusing together again and the water turned light brown.
Conclusion: Neat! Might try this again if I get a hold of some everclear. Here in Pennsylvania, you have to special order that stuff.
reply
baltakatei
08: 27 This is a bit too ambiguous. I think a better way to phrase it is -The solvent moves from the side with the lower solute concentration to the side with the higher solute concentration-.
The point of the semipermeable membrane is that it prevents the solute from flowing from the the side of higher solute concentration to the side of lower solute concentration; therefore the solvent moves instead; the driving force of this solvent flow is -osmotic pressure-.
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08: 27 This is a bit too ambiguous. I think a better way to phrase it is -The solvent moves from the side with the lower solute concentration to the side with the higher solute concentration-.
The point of the semipermeable membrane is that it prevents the solute from flowing from the the side of higher solute concentration to the side of lower solute concentration; therefore the solvent moves instead; the driving force of this solvent flow is -osmotic pressure-.
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6alecapristrudel
The osmosis explanation sounds ambiguous or just plain wrong, the concentration of a solution refers to the amount of stuff dissolved in a solvent, not to the solvent itself.
It moves from the side with less dissolved stuff in it to the side with more stuff in solution until concentrations equalize.
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The osmosis explanation sounds ambiguous or just plain wrong, the concentration of a solution refers to the amount of stuff dissolved in a solvent, not to the solvent itself.
It moves from the side with less dissolved stuff in it to the side with more stuff in solution until concentrations equalize.
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Rohwer
I was really glad there weren't too many new terms presented in this video: considerably easier to understand when there aren't so many terms thrown at you that you're expected to know to understand the rest of what's going on.
I really love understanding these engineering principles more in-depth!
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I was really glad there weren't too many new terms presented in this video: considerably easier to understand when there aren't so many terms thrown at you that you're expected to know to understand the rest of what's going on.
I really love understanding these engineering principles more in-depth!
reply
Pyruvate
There are quite a few technical innacuracies in this video, but I suppose that it suffices for a crash-course video. For high school chemistry students, this seems quite useful, but if you are a ChemE student, I would suggest looking to another source for technically accurate information.
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There are quite a few technical innacuracies in this video, but I suppose that it suffices for a crash-course video. For high school chemistry students, this seems quite useful, but if you are a ChemE student, I would suggest looking to another source for technically accurate information.
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Dan
People, don't get deluded by this super nice and cute explanation! The engineering and calculations behind these (unit) operations are hell, a lot of empiricism, graphical methods, loads of simplifications, rules of thumb, heuristics. It's at the same time brilliant and dirty as heck XD
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People, don't get deluded by this super nice and cute explanation! The engineering and calculations behind these (unit) operations are hell, a lot of empiricism, graphical methods, loads of simplifications, rules of thumb, heuristics. It's at the same time brilliant and dirty as heck XD
reply
Rishi
Is this a chemistry application to engineering. Cause we did cover the very basics and a lot of this crash course engineering video has some chemistry concepts like reversibility thermochemistry/thermodynamics.
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Is this a chemistry application to engineering. Cause we did cover the very basics and a lot of this crash course engineering video has some chemistry concepts like reversibility thermochemistry/thermodynamics.
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woled
So, this is what my father do in Saudi Arabia. Me and my family live there because of his work there. After Seven years in Saudi Arabia, I finally learned what happens in my father' work.
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So, this is what my father do in Saudi Arabia. Me and my family live there because of his work there. After Seven years in Saudi Arabia, I finally learned what happens in my father' work.
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6alecapristrudel
That distillation column diagram gave me terrible flashbacks.
BEGONE DEMONIC EQUATIONS, I CONDEMN THEE TO AN EXCEL TABLE, NEVER TO BE LOOKED AT AGAIN!
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That distillation column diagram gave me terrible flashbacks.
BEGONE DEMONIC EQUATIONS, I CONDEMN THEE TO AN EXCEL TABLE, NEVER TO BE LOOKED AT AGAIN!
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Francois
Fun fact. One cannot produce pure ethanol by the distillation of a water-ethanol mixture. The best one can get is just under 96% ethanol.
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Fun fact. One cannot produce pure ethanol by the distillation of a water-ethanol mixture. The best one can get is just under 96% ethanol.
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