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Topic: precipitate in DMSO  (Read 2742 times)

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Offline Geoffrey Smith

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precipitate in DMSO
« on: June 26, 2014, 09:00:50 AM »
I've just noticed a clear crystalline precipitate in my commercial bottle of 99.5% dimethyl sulfoxide (CAS 67-68-5).  I assume the reagent is now bad, but what is the ppt.? 
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Offline opsomath

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Re: precipitate in DMSO
« Reply #1 on: June 26, 2014, 09:27:09 AM »
I'm guessing the air conditioning has been coming on a lot lately. DMSO freezes around the temperature of a cool room; your precipitate is solid DMSO.
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Offline kamiyu

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Re: precipitate in DMSO
« Reply #2 on: June 26, 2014, 10:41:26 AM »
Yeah, I agree. Indeed, this is called "partial freeze" and this is used for purification of ethanol (well, you may say concentrating ethanol). The solid part contains purer DMSO, which means less water contained in it.
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