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Author: Subject: Nearly glacial acetic acid
Chemgineer
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[*] posted on 26-5-2021 at 14:36
Nearly glacial acetic acid


I produced some quite concentrated acetic acid by reacting sodium acetate with sodium bisulphate and condensing the gas into a beaker. It is definitely quite concentrated, the smell hurts the nose!

I put it in the fridge to see if it would easily freeze solid however it stayed a liquid so I must have some traces of water in the solution.

Can I boil this solution down to release the aziotrope of acetic acid and water leaving eventually pure acetic acid?
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clearly_not_atara
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[*] posted on 26-5-2021 at 14:53


Sodium bisulfate is hygroscopic and forms a monohydrate. This might explain your observations. I think there are some (insoluble) salts you can use to dehydrate GAA the last-little-bit, but I can't remember which. Boiling likely works, but you could lose a fraction of your acetic acid (it is zeotropic).



[Edited on 04-20-1969 by clearly_not_atara]
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UC235
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[*] posted on 26-5-2021 at 15:25


Acetic acid does not form an azeotrope, so that's a non-option.
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