Acid/base extraction

[chiddler]

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TBR says that 4-ethylcyclohexane can be extracted via acid/base techniques. I call bs.

?

 

[MedPR]

TBR says that 4-ethylcyclohexane can be extracted via acid/base techniques. I call bs.

?

You can extract 4-ethylcyclohexane with acid/base techniques because it will not react in acidic or basic conditions like the other things in the mixture will. It will just stay in the organic phase.

So, say you have like acetic acid and some other acid/base crap, you can precipitate them out and leave only the cyclohexane.

 

[pfaction]

MedPR, the thing is that you can't extract it from pure acid/base like you would a carbo acid or amine. Say you have this compound, in water. Then you add as much NaOH, NaHCO3, HCL as your heart desires. I don't think that would do it.

Liquid-Liquid extraction, on the other hand. Let's say you have dodecane and you add 5% HCL in equal volumes.

Actually, **** it. My example doesn't even make sense because it'd stay in that same phase. You'd have to distill or evap it out.

 

[chiddler]

You can extract 4-ethylcyclohexane with acid/base techniques because it will not react in acidic or basic conditions like the other things in the mixture will. It will just stay in the organic phase.

So, say you have like acetic acid and some other acid/base crap, you can precipitate them out and leave only the cyclohexane.

that's right.

my mistake was having the assumption that it must change when exposed to acid/base so you can make it change phases easily.

thank you very much.

 

[chiddler]

Actually, **** it. My example doesn't even make sense because it'd stay in that same phase. You'd have to distill or evap it out.

lol

thanks anyway.

 

[MedPR]

MedPR, the thing is that you can't extract it from pure acid/base like you would a carbo acid or amine. Say you have this compound, in water. Then you add as much NaOH, NaHCO3, HCL as your heart desires. I don't think that would do it.

Liquid-Liquid extraction, on the other hand. Let's say you have dodecane and you add 5% HCL in equal volumes.

Actually, **** it. My example doesn't even make sense because it'd stay in that same phase. You'd have to distill or evap it out.

Extraction of something doesn't necessarily mean pulling that something out. If you can acid/base react everything in the mixture except for one thing (like this cyclohexane thing) all you have left is cyclohexane.

 

[syoung]

do you guys post on this mcat forum all day/night? useful stuff though, i didn't realize how much ochem and gchem i forgot in 3 years...gotta devise my schedule soon!

 

[MedPR]

do you guys post on this mcat forum all day/night? useful stuff though, i didn't realize how much ochem and gchem i forgot in 3 years...gotta devise my schedule soon!

I used SDN as a study aid once I finished content review. Explaining stuff I know makes it stick much better in my head, and being able to ask a specific question and get a specific answer is much easier than googling for hours 🙂

 

[BerkReviewTeach]

I used SDN as a study aid once I finished content review. Explaining stuff I know makes it stick much better in my head, and being able to ask a specific question and get a specific answer is much easier than googling for hours 🙂

It's a great idea to do this. There was someone about a year ago who said he studied by spending and hour or two each day here in the Q&A forum, figuring that he'd get exposed to difficult questions from all different sources that way. He did pretty well.

 

[MedPR]

It's a great idea to do this. There was someone about a year ago who said he studied by spending and hour or two each day here in the Q&A forum, figuring that he'd get exposed to difficult questions from all different sources that way. He did pretty well.

I hope I have a similar result as him then!

 

[Buttafuoco]

I can't do anything except watch TV and surf the net since my MCAT. I thought I'd want to go out friday and saturday, but i've felt more like i've needed a week long rape shower.

 

[MedPR]

I can't do anything except watch TV and surf the net since my MCAT. I thought I'd want to go out friday and saturday, but i've felt more like i've needed a week long rape shower.

I've been on here and playing bloons tower defense 5. Waiting for diablo 3 to come out!