Sciencemadness Discussion Board
Not logged in [Login - Register]
Go To Bottom

Printable Version  
Author: Subject: Is sodium acetate hygroscopic?
Foeskes
Hazard to Others
***




Posts: 127
Registered: 25-2-2017
Member Is Offline

Mood: No Mood

[*] posted on 3-3-2018 at 17:35
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]
View user's profile View All Posts By User
Eddygp
International Hazard
*****




Posts: 834
Registered: 31-3-2012
Location: University of York, UK
Member Is Offline

Mood: Organometallic

[*] posted on 3-3-2018 at 17:48


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
View user's profile View All Posts By User
Foeskes
Hazard to Others
***




Posts: 127
Registered: 25-2-2017
Member Is Offline

Mood: No Mood

[*] posted on 3-3-2018 at 18:17


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.
View user's profile View All Posts By User
JJay
International Hazard
*****




Posts: 2836
Registered: 15-10-2015
Location: Western Hemisphere
Member Is Online

Mood: under the weather

[*] posted on 3-3-2018 at 19:49


I have wondered if sodium acetate would be a good desiccant for acetic acid....



This is my YouTube channel: Extreme Red Cabbage. I don't have much posted, but I try to do nice writeups once in a while.
View user's profile View All Posts By User
clearly_not_atara
International Hazard
*****




Posts: 1037
Registered: 3-11-2013
Member Is Offline

Mood: No Mood

[*] posted on 3-3-2018 at 20:04


Sodium acetate also binds to acetic acid, forming sodium diacetate.



[Edited on 04-20-1969 by clearly_not_atara]
View user's profile View All Posts By User
XeonTheMGPony
International Hazard
*****




Posts: 888
Registered: 5-1-2016
Member Is Offline

Mood: No Mood

[*] posted on 4-3-2018 at 05:14


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
View user's profile View All Posts By User
Foeskes
Hazard to Others
***




Posts: 127
Registered: 25-2-2017
Member Is Offline

Mood: No Mood

[*] posted on 4-3-2018 at 06:23


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.
View user's profile View All Posts By User
XeonTheMGPony
International Hazard
*****




Posts: 888
Registered: 5-1-2016
Member Is Offline

Mood: No Mood

[*] posted on 6-3-2018 at 04:04


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.
View user's profile View All Posts By User
weilawei
Hazard to Self
**




Posts: 70
Registered: 3-12-2017
Member Is Offline

Mood: No Mood

[*] posted on 6-3-2018 at 06:06


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.
View user's profile View All Posts By User

  Go To Top