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DNA
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Just another thing about the peroxides I just read in a book:
To test for peroxides:
A more quantative method involves adding 1 mL of the liquid to an equal volume of a 10% sodium iodide in glacial acetic acid solution. A yellow color
indicates a low peroxide concentration, whereas a brown color indicates a high peroxide concentration. If the concentration of peroxide is not too
great, the material can be salvaged by shaking with aquous ferrous sulfate. In the case of a water-soluble ether, solid CuCl may be used to remove
traces of peroxides.* Large amounts of peroxides may be removed by storing the liquid over activated alumina or by running the liquid through an
activated alumina column. CAUTION: Do not allow the alumina to dry completely. The adsorbed peroxides may be removed by washing the alumina with an
aqueous ferrous sulfate solution.
Ref. The manipulation of air-sensitive compounds. 2nd edition, D.F Shriver, M.A Drezdzon. p86-87
* Organic Synteses, 45, 57 (1965).
[Edited on 30-9-2008 by DNA]
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Vogelzang
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see
https://www.hyperlab.info/inv/index.php?s=2ee6fc02dcbb5efbce...
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cristiro
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http://ccc.chem.pitt.edu/wipf/Web/16340.pdf
Things that we dont understand completly and things that completly dont understand.
I did a reaction to find an answer and I ended up with so many questions.
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ScienceHideout
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I store mine over KOH. Had it for 7+ months, never had a problem.
hey, if you are reading this, I can't U2U, but you are always welcome to send me an email!
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chem_haruka
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The rumour of ether in China
In China,I heard that,if you open a bottle of ether which placed in reagent cabinet for a long time,it may explode
when you open it. Because the air could oxidate ether(some bottles aren't hermetic).However,the peroxide of ether is stable at r.t. ，and only
explode under heating.
Please tell me that,is it dangerous when someone open it？
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Zombie
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There is a good thread on that here... http://www.sciencemadness.org/talk/viewthread.php?tid=10380
It's worth reading because you heard correctly.
They tried to have me "put to sleep" so I came back to return the favor.
Zom.
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mnick12
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Ya it is not a rumor,
Luckily most ether has BHT or something similair to scavenge for reactive oxygen species. The case where this doesnt happen is when the ether is meant
for grignards or analytical chemistry, then it could be full of peroxides.
If you have an open bottle of ether the best way to check is with iodide and acetic acid. Dissolve some KI or NaI in acetic acid, and add an equal
portion of ether. If the color is yellow, then you have some peroxide but are probably OK. If it is brown or black, then you need to call whoever
deals with your organic lab waste.
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Nicodem
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Threads Merged
17-5-2015 at 22:31 |
diggafromdover
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Lovely thread gents!
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