The Vespiary
The Hive => Chemistry Discourse => Topic started by: Bwiti on June 04, 2003, 11:02:00 AM
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Lets say someone mixed aqueous 5% NaOH with parsley seed oil.. Which layer will be the allylbenzenes?? Both are of about the same darkness..
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The viscosity will easily reveal which layer is the aqueous and the organic. Watch where the aqueous solution goes when you mix the liquids. It shouldn't be that hard.
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> Lets say someone mixed aqueous 5% NaOH with parsley seed oil..
why would you do that? this method seems pretty useless:
the non-propenylbenzene parts of parsley seed oil were added to
dil. NaOH in a testtube. the whole lot was shaken like crazy.
after few minutes two phases separated. => practically no purification.
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"this method seems pretty useless"
Well, the NaOH layer took on a dark color when mixed with the parsley seed oil, so some garbage must have been extracted from it.. It worked for me.
Btw, I added a drop of the top layer to a test tube half-filled with dH2O.. The top layer's the substituted allylbenzenes.
:)
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Like always if there are no halogens in the molecule... :)
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> Well, the NaOH layer took on a dark color when mixed
yes, in my experiment too. that means nothing. the layer
did not get significantly smaller. 49% or 50%, why bother?
(otoh, if it makes u happy - do what ever you want...)
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and oxygen, sometimes, isn't it?
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so i deleted my post
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Bwiti, they are right about the amount of impurities being removed. It's very small, but it's ok. however, the idea that the NaOH might cause some polymerization (with a little heat or if it sits overnight) makes me think that it's not the best idea. Don't wash anything- distill first, then wash to help clean the final product. Be sure to dry your product and then do a final distillation.
if done correctly (and if you starting material was worth the money) you should get 98%+ purity.