Foeskes
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Is sodium acetate hygroscopic?
So I made sodium acetate trihydrate by reacting glacial acetic acid and sodium hydroxide and boiling until a thin layer of the salt starts forming on
the surface and I let it cool and scraped the crystal into paper towel and let it absorbed overnight. Next morning it was nothing more than a pool of
slightly viscous sodium acetate solution.
I thought it wasn't hygroscopic.
do I have to use a desecator?
[Edited on 4-3-2018 by Foeskes]
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Eddygp
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Not only is it hygroscopic; it is deliquescent. This means it will absorb so much water vapour from the air, even at non-100% humidity, that it will
dissolve in it!
there may be bugs in gfind
[ˌɛdidʒiˈpiː] IPA pronunciation for my Username |
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Foeskes
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I put it in desecator and pulled a slight vaccum, will it work.
Note: it's a thick glass cookie jar with a acrylic top and a silicone gasket, and my pump is a crude modified car tire inflator, I am also using
silica gel as the desecator.
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JJay
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I have wondered if sodium acetate would be a good desiccant for acetic acid....
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clearly_not_atara
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Sodium acetate also binds to acetic acid, forming sodium diacetate.
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XeonTheMGPony
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Not that I have noticed I have a larg block of it sitting open to atmosphere for well over half a year, sure it absorbed some moisture but no where
enough to liquefy it lol, think buddy there miss-thought and quoted for hydroxide.
some point I'll be dehydrating it to make glacial acetic acid
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Foeskes
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I was really wet and pretty much a gel maybe the water content was enough to dissolve it or something.
The pH was and still is neutral.
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XeonTheMGPony
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I purified mine and filtered it then ruff dried it, and there it has sat for all most a year open to atmosphere and not once has it gelled or been
moist to touch.
I recrystallize in methanol then filter out any impurities that do not dissolve then, recrystallize and filter, then wash with ice cold methanol.
I then distill the depleted mother liquor to recover fresh batch of methanol for the next run.
Product is pure white fluffy crystals of high purity.
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weilawei
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XeonTheMGPony, I'll have to try recrystallizing from methanol. I just finished a small run making sodium acetate trihydrate from vinegar and NaOH, but
the yield was pretty slight (5.04g). I think I lost a good deal of product (4/5 of it roughly) in the recrystallization due to its extreme solubility
in water. I kept the mother liquor, so I'll see what else I can get out of it.
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