Alberti Posted September 29, 2007 Share #21 Posted September 29, 2007 Advertisement (gone after registration) Isopropyl alcohol forms an azeotrope with water at 88% IPA/12% water by weight (96% ethanol/4% water for alcohol). Anything higher than 88% IPA has been azeotropically distilled. I'm not sure how hygroscopic IPA is, so if you left a 100% IPA "solution" out on the bench it might draw water from the atmosphere over time, or it might not. If you keep it in an air-tight container, you should be OK though. If the bottle is plastic, it will 'leak' water into the bottle. I have a plasic bottle with mineral water designed by Philip Starck, and after 10 years stading 'on exhibit' the bottle is now 30% empty! So even having this anhydrous thing fully locked it will attract H2O molecules, in effect still slowly 'leaching water from the atmosphere' I think. Link to post Share on other sites More sharing options...
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amigadave Posted September 29, 2007 Share #22 Posted September 29, 2007 If the bottle is plastic, it will 'leak' water into the bottle. I have a plasic bottle with mineral water designed by Philip Starck, and after 10 years stading 'on exhibit' the bottle is now 30% empty! So even having this anhydrous thing fully locked it will attract H2O molecules, in effect still slowly 'leaching water from the atmosphere' I think. Yes, that's true. My lab bottle is made of glass (significantly less water-permeable than most plastics), but it is recommended that lab solvents such as this are used within a year or two, so that contamination is not too great. Link to post Share on other sites More sharing options...
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