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reckless explosive
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drying isopropanol
i have some 91% isopranol from the drug store and i wanted to know if calcium chloride could dry it to anhydrous because i have no distillation kit,
and no source to buy anhydrous isopropanol.and i was wondering if it would require a large amount of CaCl2 because i dont want to waste a huge amount
just for a little bit of isopropanol
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entropy51
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Quote: Originally posted by reckless explosive  | | i have some 91% isopranol from the drug store and i wanted to know if calcium chloride could dry it to anhydrous because i have no distillation kit,
and no source to buy anhydrous isopropanol.and i was wondering if it would require a large amount of CaCl2 because i dont want to waste a huge amount
just for a little bit of isopropanol |
I can't believe that you started a new thread on this. It has been
covered here so many times that it isn't funny.
SEARCH and ye shall find.
Hint: K2CO3.
If you didn't know that you can't dry alchohols with CaCl2 then you probably don't need isopropanol.
[Edited on 23-1-2012 by entropy51]
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reckless explosive
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okay one the search option sucks, two CaCl2 is the only dessicant i have other than sodium hydroxide and i cant get ahold of K2CO3, and three i just
need it to extract cinnameldahyde(i dont care if thats spelt wrong) and i wanted best possible yield...
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UnintentionalChaos
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Use google's search which is superior. Type in site:sciencemadness.org dry isopropanol as the search terms and see what comes up.
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
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Hexavalent
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Have a look in the lawn/garden store for K2CO3.
"Success is going from failure to failure without loss of enthusiasm." Winston Churchill
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Bot0nist
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HIT THE LITERATURE! There is literally thousands of suitable drying agent charts on the net. Plus Almost every basic chem text covers this. Please
spend some time in the library and read the basics. Vogel is a good place too, check out the SciMad library.
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
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zoombafu
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Even if you used lots of drying agent, it would still be better to distill then dry, because the 8% water will be a lot easier to get rid of by
distillation. Its the last 1% or less that the drying agent will be good for.
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reckless explosive
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to just shut this down and im very sorry for wasting all you guys time but could 91% be used for the extraction from cinnamon atleast to get a little
bit i dont need it in massive quantities for an experiment just to have to add to collection of self made chemicals...and botonist i agree with you
100% on that literature is the best the only problem is y school library has no chem books nor does my local library trust me i checked there first
before coming here, but if you could offer up the name of a few amazing books for the begginer i could easily tell my librarian(its good being friends
with everyone in your school) to order the in...i know all of this is way off my original topic but it will stop me from posting more seemingly stupid
topics later on...
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UnintentionalChaos
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| Quote: Originally posted by zoombafu | | Even if you used lots of drying agent, it would still be better to distill then dry, because the 8% water will be a lot easier to get rid of by
distillation. Its the last 1% or less that the drying agent will be good for. |
91% is an azeotrope.
[Edited on 1-24-12 by UnintentionalChaos]
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
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entropy51
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| Quote: Originally posted by zoombafu | | Even if you used lots of drying agent, it would still be better to distill then dry, because the 8% water will be a lot easier to get rid of by
distillation. Its the last 1% or less that the drying agent will be good for. |
Try distilling it and you
will find that the distillate has exactly as much water as you started with.
That's what UnintentionalChaos means by an azeotrope.
Don't you guys ever read chemistry books?
I have never seen so much misinformation posted on this forum as is coming from the latest crop of new members.
Better to remain silent and appear a fool than to open your mouth and remove all doubt.
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Bot0nist
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| Quote: Originally posted by reckless explosive | | to just shut this down and im very sorry for wasting all you guys time but could 91% be used for the extraction from cinnamon atleast to get a little
bit i dont need it in massive quantities for an experiment just to have to add to collection of self made chemicals...and botonist i agree with you
100% on that literature is the best the only problem is y school library has no chem books nor does my local library trust me i checked there first
before coming here, but if you could offer up the name of a few amazing books for the begginer i could easily tell my librarian(its good being friends
with everyone in your school) to order the in...i know all of this is way off my original topic but it will stop me from posting more seemingly stupid
topics later on... |
Here are a couple resources to get you started.
http://cavemanchemistry.com/oldcave/
Do all the projects you can. DON'T skip unit factors and stoichiometry. Read up on significant figures too. These are some really boring bits of
chemistry, but they are essential to everything and once you know them it's like riding a bike. The rest of the projects are really fun and hands on.
http://library.sciencemadness.org/library/index.html
Some of the best books for advanced chemistry. read at your leisure or download for free.
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
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neptunium
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kids are killing me theses days!! i whish i had the internet back when i started chemistry!
or even a computer for that matter!
i spent hours and hours at the library and book stores...got a whole collection of books over the years, and still learn today!
i`ll give you that though .things are much different about the whole science and chemistry hobby than they were 20 years ago thats true ,
ever heard of salting out?
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Dr.Bob
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| Quote: Originally posted by reckless explosive | | could 91% be used for the extraction from cinnamon at least to get a little bit? I don't need it in massive quantities for an experiment just to
have to add to collection of self made chemicals... |
Traces of water will not interfere with the extraction of most chemicals with alcohols. 50-90% ethanol is often used for extracting food grade
extracts. Certainly for some chemicals, lower water is best, but for many extractions 10% water will not bother them. I would suggest that you
might be able to buy 95% ethanol in small amounts for extracts as well. (If over the legal age...) or at least distill small amounts from other
sources.
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reckless explosive
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wow once i admitted i was stupid and wrong thats when all the nice comments came thats awesome. but botonist thank you ALOT because i literally have
no paper literature in my town so that will help alot and i have read up on a few of the things you mentioned just not alot and obviously not enough.
and thank you dr.bob the only proble is the product you talk about is everclear and where i live its illegal to sell it and im not old enough anyway,
i think the strongest ethanol i could sneak is 72.5% as bacardi 151. and i think once i get my shipment of glassware and stuff i could cobble together
a very basic distillation kit and aybe if i do it in a small enough quantity not to get caught but i could make my own ethanol(shine method ) and i could of swore i've seen people dry ethanol with CaCl2...and yes i know
there is a difference from isopropanol and ethanol..
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Bot0nist
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Find a drying agents chart and print it out to hang in your lab space.
It will probably be hard do get near anhydrous EtOH with a rigged-up still, unless you make it good, with a column and an efficient condenser, I
guess copper would be traditional. There are some good plans on the net for stills, but you will have to spend some money to build it. Might be best
to just invest in some good glass if you can. You won't regret it.. It's easy to get 50%-80%, but > 90% takes me a couple of runs with my 24/40
setup (from white table wine:12.5% ABV), without using desiccants that is.
You can probably find "Denatured Alcohol" at Home Depot or Walmart in the solvent section by hardware. It's usually fairly dry. Around 95% I would
hope. And just some trace impurities to make un-consumable. It's cheap as dirt, but you may have to be 18 to buy it.
[Edited on 25-1-2012 by Bot0nist]
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
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reckless explosive
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okay i will do that and i looked up the msds of the denatured alcohol at true value(closest hardware store and they have sooooo much) and it said it
was 80% EtOH 19% i believe is methanol and the other 1% is denatonium benzoate and i think its like 7 dollars a quart which i think would be worth it
if it didn't have so much methanol.
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entropy51
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I doubt that you're supid, but ignorance is easly remedied by spending
some time with those ancient devices called "books" of which there is a nice selection in the forum library.
And the forum search engine doesn't really suck as bad as you seem to think. Just use it often enough to learn its quirks.
If you really need dry isopropanol, the hardware stores sell a gasoline additive (anti-freeze) called "Iso-Heet" which is very nearly pure
isopropanol. Some people distill it, but I normally use it straight out of the bottle.
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Bot0nist
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The MeOH will be fine in most reactions and extractions. Just not for consumption, of course. It is well worth the money. Try and pick up useful
solvents when you can. Acetone, EtOH, MeOH, IPA, xylene, hexane, ether. All at the local hardware strores. Your 91% IPA should work fine. I recently
used it for a successful piperine extraction with 91% IPA and it worked like a charm. The workup and pics are in a piperine extraction thread here
somewhere. A subject search of piperine and 91% IPA will find it.
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
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reckless explosive
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thanks everyone for your amazing help and botonist i know what you mean by stocking up on solvents and once i get some money im gonna get a gallon of
the alcohol a gallon of M.E.K and a gallon of acetone and xylene and also does
anyone know the name of the garden related product that contains K2CO3 i dont want spoonfeed terribly(even though i think i already have been) but i
dont wanna look suspicious picking up every single product to read the ingredients..
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entropy51
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| Quote: Originally posted by reckless explosive | | does anyone know the name of the garden related product that contains K2CO3 i dont want spoonfeed terribly(even though i think i already have been)
but i dont wanna look suspicious picking up every single product to read the ingredients.. |
NIH has a
household product database that you can search by name of ingredient. It can be quite useful. The link is: http://householdproducts.nlm.nih.gov/products.htm
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reckless explosive
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thank you that will help ALOT
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reckless explosive
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okay i searched K2CO3 and the product with the highest percentage i've never heard of and it only containned a max of 5%...
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entropy51
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The local hardware store once had aphid dust or some such that was 85% K2CO3. I didn't buy it because I had enough already, so I
don't recall the name of it. That product might still be available.
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Arthur Dent
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You can buy very pure food grade Potassium Carbonate at wine/beer making supplies shops, and also some chinese grocery stores, it is an ingredient
used to prepare ramen noodles.
Robert
--- Art is making something out of nothing and selling it. - Frank Zappa ---
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k2976
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3A molar sieves
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