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Author: Subject: Crystals formed in my acetone. What could they be?
nannah
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[*] posted on 4-1-2015 at 13:57
Crystals formed in my acetone. What could they be?


Hi guys. Today when i took a look at my OTC acetone i found that small white crystals had formed. I have it standing in the fridge, in a erlenmeyer flask thats wrapped in aluminum foil to keep it from evaporating.

Before i put it in the fridge a couple of days ago i tried to dry it with some CaCl² to see if there were any water in it.

On the bottle and its msds it said that its just acetone in there.

/n
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[*] posted on 4-1-2015 at 14:08


Weird. Maybe a very small amount of calcium chloride dissolved in the acetone, and crystallized out when you put it in the fridge.



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[*] posted on 4-1-2015 at 14:13


Get a crystal out, dry it and place in a methanol or natural gas burner flame on a clean loop of Pt wire. Does it give the characteristic Calcium pink-orange spectrum to a flame?

[Edited on 4-1-2015 by Bert]




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[*] posted on 4-1-2015 at 15:38
use of CaCl2 with ketones and aldehydes


Due to the possible presence and/or formation of Ca(OH)2 and CaCl(OH) using CaCl2 is not recommended so even if the test for CaCl2 fails you may have one of the impurities listed ppt or a reaction product from the reaction of hydroxyl with acetone (http://bit.ly/1AcxPSh). I haven't worked through this but I would imagine a small degree of nucleophillic attack (Bert?)possibly forming a ppt. You might try a melting point.



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