How To Determine Solubility - Video Tutorials & Practice Problems
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Only one rule to know here:Like polarity dissolves like polarity.
1
concept
Understanding “like dissolves like”.
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1m
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alright, guys. And I want to talk about a really easy topic that has to do with Elektra negativity, and that is solid ability. So I went ahead and took the luxury of pre drawing this little diagram for you. It's very scientific. And I thought that it would help us understand the rule of solid ability, which is just that, like, dissolves like All right, so you might have heard this in lab before, and all it means is this This has to do with polarity. Okay, so remember that we learned how to figure out if molecules had a net dipole. That's all there is to it. We're gonna figure out okay, What? We're dissolving or Yeah, What were dissolving? Is it going into something that has the same polarity as itself? So this is a very common scene from Friday night. Maybe Maybe this was a few nights ago for you. You're pouring a bottle and you're pouring it into a cup of water. And you got your ethanol little molecules spilling out and they go into the water molecules, which you're right down here. And you're not thinking for a second that they're going to split apart and you're gonna have alcohol in the top and water on the bottom. That would be really weird. In fact, what happens is that they just mix together and you can't even tell the difference. Except you can tell the difference in the morning the next morning. You know that obviously, you weren't just drinking water. So that has to do with the fact that both have the same polarity or similar polarity. Think about it. Water. Let's just expand this a little bit. Water has a net die poll. Right? We said that the net Die poll was pretty strong. Well, in the same way, ethanol also has a net dipole. Okay, so in this case, I kind of drew it so that the net die poet face the other direction. But it doesn't matter. It doesn't really matter what direction it's facing, because obviously I could rotate that alcohol. The important thing is that they both have a strong net dipole. Since they're both polar, they're going to dissolve into each other. Okay, so that's the entire concept between, like, dissolves like
Want a vodka tonic right about now? The reason they mix together is due to similar polarity between molecules. Not that you should know about this if you are under the age of 21! Duh.
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concept
Introducing common solvents and other molecules in organic chemistry.
Video duration:
2m
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So I went ahead and took the luxury of pre drawing this little diagram for you. It's very scientific. And I thought that it would help you guys understand the rule of solid ability, which is just that like dissolves like All right, So you might have heard this in lab before. And all it means is this this has to do with polarity. Okay, So remember that we learned how to figure out if molecules had a net dipole, that's all there is to it. We're going to figure out, Okay, what we're dissolving or Yeah, what we're dissolving? Is it going into something that has the same polarity as itself? So this is a very common scene from friday night. Maybe, maybe this was a few nights ago for you. You're pouring a bottle and you're pouring it into a cup of water and you've got your ethanol, little molecules spilling out and they go into the water molecules which are right down here and you're not thinking for a second that they're going to split apart and you're going to have alcohol on the top and water on the bottom. That would be really weird. In fact what happens is that they just mixed together and you can't even tell the difference except you can tell the difference the morning the next morning. You know that obviously you weren't just drinking water. So um that has to do with the fact that both have the same polarity or similar polarity. Think about it. Water. Let's just expand this a little bit. Water has a net die pole. Right? We said that the net die pool was pretty strong. Well in the same way, ethanol also has a net die pool. Okay, so in this case I kind of drew it so that the net die pole would face the other direction. But it doesn't matter, it doesn't really matter what direction it's facing because obviously it could rotate that alcohol. The important thing is that they both have a strong net die pool since they're both polar, they're gonna dissolve into each other. Okay, so that's the entire concept between like like dissolves like
An aqueous solution is one with water. That’s pretty much it. The following molecules are commonly used in organic chemistry - so it’s a good idea to know what their solubilities are.
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Problem
Problem
Would you expect the following molecule to be miscible in an aqueous solution?
A
Miscible
B
Immiscible
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Problem
Problem
Would you expect the following molecule to be miscible in an aqueous solution?
A
Miscible
B
Immiscible
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Problem
Problem
Would you expect the following molecule to be miscible in an aqueous solution?
A
Miscible
B
Immiscible
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Problem
Problem
Would you expect the following molecule to be miscible in an aqueous solution?
A
Miscible
B
Immiscible
Hint: Draw the Lewis structure before deciding!
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Problem
Problem
Would you expect the following molecule to be miscible in an aqueous solution?
A
Miscible
B
Immiscible
Hint: Draw the Lewis structure before deciding!
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Problem
Problem
Would you expect the following molecule to be miscible in an aqueous solution?
A
Miscible
B
Immiscible
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