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Ethanol, again

http://www.chromforum.org/viewtopic.php?t=12172

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Ethanol, again

Posted: Tue Feb 02, 2010 7:01 pm
by HPLC_Help
HI, all -

This isn't an LC question per se, but it is relevant to my standard preparations.

Will a bottle of 190 proof ethanol take on water over the span of a couple years due to repeated opening and closing the lid? References?

There is a debate here in the lab.

Thanks!

H_H

Posted: Wed Feb 03, 2010 12:07 am
by tom jupille
From Wikipedia (http://en.wikipedia.org/wiki/Ethanol):
Mixtures of ethanol and water form an azeotrope at about 89 mole-% ethanol and 11 mole-% water[15] or a mixture of about 96 volume percent ethanol and 4% water at normal pressure and T = 351 K. This azeotropic composition is strongly temperature- and pressure-dependent and vanishes at temperatures below 303 K[16].
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