How to Purify 70 Ethyl Rubbing Alcohol

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=HOkKawJRZsk

See my write-up of this experiment on sciencemadness: http://www.sciencemadness.org/talk/vi... • In this video, I'll show you how to purify 70% ethyl rubbing alcohol from the pharmacy into nearly anhydrous reagent grade ethanol. • The purification process involves 3 main steps (and an optional one): • 1) Simple distillation • This concentrates the ethanol to about 85% and leaves behind higher-boiling impurities like MIBK and Denatonium benozate • 2) Drying • The ethanol is dried using MgSO4 and filtered. Other appropriate drying agents like K2CO3 and molecular sieves could be used. • 2a) Fractional distillation OPTIONAL • This is to remove the acetone. Discard the acetone distillate that comes over at 56 C and stop the distillation once the temp rises above 56 C. • 3)Final simple distillation • Finally, we distill off the ethanol from any MgSO4 that may have dissolved in it. This distillation is nto necessary if you used molecular sieves. • **WARNING**** • This ethanol is intended to be used as a lab solvent or reagent ONLY. IT IS NOT intended for topical or ingestion purposes. • Contact me: • My Channel Home Page: / thechemistryshack • Follow me on Google+ • +TheChemistryShack • My email: • [email protected]

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