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Author: Subject: iron mess to clean from rb flask
not_important
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[*] posted on 12-1-2008 at 16:47


Piranha Solution:

http://web.princeton.edu/sites/ehs/labsafetymanual/cheminfo/...

http://web.mit.edu/cortiz/www/PiranhaSafety.doc

http://www.enma.umd.edu/LAMP/Sop/Piranha_SOP.htm

http://smfl.microe.rit.edu/piranha

http://ehs.uky.edu/ohs/piranha.html


Generally you don't keep piranha around once used, especially if you've mixed the acid and peroxide to some ratio, then started the cleaning. If you start with the H2SO4 and warm it up, then dribble in H2O2 giving it plenty of time to react and not build up an excess, you can let the used acid sit for awhile, as often the reaction continues for a period of time, then slowly heat it up to 150 C or so, leaving it as mostly H2SO4 with any inorganic salts formed in the cleaning. If the acid isn't strongly discoloured, you can store it for reuse. I would not store premixed piranha for any length of time.
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stoichiometric_steve
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[*] posted on 13-1-2008 at 10:19


Quote:
Originally posted by not_important
I would not store premixed piranha for any length of time.


i left some pretty dilute piranha in an emaille pot for about a week. when i came back, the pot had a tiny hole where the acid crept on the work bench, ruining the plastic coated wood surface.
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[*] posted on 20-8-2010 at 16:20


Quote: Originally posted by YT2095  
if it`s Just iron, then Oxalic acid works wonders :)


I can vouch for that. I recently bought an Allihn condenser off eBay with a bad rust deposit in the cooling jacket. As recomended on this forum I filled the jacket with aqueous oxalic acid solution (5wt%), and within an hour the rust color had completely disappeared!

I normally woudn't buy glassware that looked that bad but it had the rare 40/50 taper fitting.




The single most important condition for a successful synthesis is good mixing - Nicodem
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Sedit
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[*] posted on 20-8-2010 at 18:55


Hey maybe Im to much of a free thinker and all but..... Have you tryed to use common rust remover to get ride of it? Its sodium bisulfite and a couple other things which I cant remember but its made for removing Fe contamination from stuff so it seems like its pretty much what your looking for. Try the laundry isle.




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[*] posted on 20-8-2010 at 19:26


Buy rust remover, buy oxalic acid. I already had the oxalic acid on hand. Where I live rust from tap water does not occur. So I'm done now.



The single most important condition for a successful synthesis is good mixing - Nicodem
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