AirCowPeaCock
Hazard to Others
Posts: 311
Registered: 9-1-2012
Location: In your nation!
Member Is Offline
Mood: Hazardous
|
|
Sodium acetate solubility?
According to wiki NaOAc is "soluble in ethanol (5.3 g/100 mL (trihydrate)" I take it that does not apply to the anhydrous form?
What else is it soluble, I have some organic contaminates in my NaOAc from a runaway reaction that happened near by (sorta.) They should be soluble
in isopropanol, acetone, or MEK. Thinking I could convert the Trihydrate I have to anhydrous by heating then solvate the impurities in one of the
three solvents above--the NaOAc shouldn't solvate in them--right?
BOLD
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
Dude, if you think like you write, I will send you a prescription for methylphenidate.
If you want to get rid of impurities in NaOAc you can probably just recrystallize it from water. If need be wash the crystals in a little cold
solvent, like maybe absolute isopropanol (Iso-Heet from the hardware store).
If you don't have a Merck Index, get one. It often lists the solubilities in common solvents.
Converting the trihydrate to anhydrous is possible, but it takes practice to do it without carbonization. Rumor has it that a microwave works and
this is on my list of things to try soon.
|
|
|
AirCowPeaCock
Hazard to Others
Posts: 311
Registered: 9-1-2012
Location: In your nation!
Member Is Offline
Mood: Hazardous
|
|
Sadly I have one, but its burried in piles and piles of my books, and I havnt seen it for over a year..but I could look again. Recrystalization
doesn't really work, because its hard to get it to crystalize without having enough water to....it just turns into one big crystal or no crystals
atall. Acetone worked fine, it needs a second rinse, but no problems there. Iso-heet has 1% propitwry additives, any idea what they might be? Its
kinda orange, its sopposed to chelan your engine, but I doubt it really does anything, isopropanol wouldnt
BOLD
|
|
|
entropy51
Gone, but not forgotten
Posts: 1612
Registered: 30-5-2009
Member Is Offline
Mood: Fissile
|
|
Quote: Originally posted by AirCowPeaCock  | | Recrystalization doesn't really work, because its hard to get it to crystalize without having enough water to....it just turns into one big crystal or
no crystals atall. |
What you describe must not have been NaOAc. I've recrystallized it at least 50 times
without anything like that happening. Use enough water so that it's not a syrup and it will make nice crystals, and get quite hot when it does so.
|
|
|
AirCowPeaCock
Hazard to Others
Posts: 311
Registered: 9-1-2012
Location: In your nation!
Member Is Offline
Mood: Hazardous
|
|
Hmm.. its definetly NaOAc, maybe I chilled it too much.. doesn't really matter, I've got it reasonably pure now. Maybe the impurities messed up the
recrystalization somehow
BOLD
|
|
|
Arthur Dent
National Hazard
Posts: 553
Registered: 22-10-2010
Member Is Offline
Mood: entropic
|
|
@entropy51: Most drugstores carry isopropanol in the regular 70% solution and in the 99% grade, that's my main solvent since it's quite inexpensive
($2.50 for 500ml) and best of all, it has no additives.
Robert
--- Art is making something out of nothing and selling it. - Frank Zappa ---
|
|
|
AirCowPeaCock
Hazard to Others
Posts: 311
Registered: 9-1-2012
Location: In your nation!
Member Is Offline
Mood: Hazardous
|
|
Ive never seen anything over 97% for antiseptic use. But ive got a bottle of 97% now. Could I distil it the same way ethanol is distiled to 99+%?
BOLD
|
|
|
Bot0nist
International Hazard
Posts: 1559
Registered: 15-2-2011
Location: Right behind you.
Member Is Offline
Mood: Streching my cotyledons.
|
|
| Quote: Originally posted by AirCowPeaCock | | Ive never seen anything over 97% for antiseptic use. But ive got a bottle of 97% now. Could I distil it the same way ethanol is distiled to 99+%?
|
Shake with some anhydrous CuSO<sub>4</sub> or MgSO<sub>4</sub> (epsom salt, dehydrate in oven) and decant. Then distill to get
near anhydrous IPA. I even like to add a bit more of the anhydrous salt in the boiling flask before final distillation. Some argue that heating a
solution with the desiccant in it is not very effective due to the dehydration of the pentahydrate or heptahydrate salt on boiling. I still think it
help keep things dry. Remember to cap the receiving flask soon after collection to helps keep it dry from the possibly humid air.
[Edited on 13-1-2012 by Bot0nist]
U.T.F.S.E. and learn the joys of autodidacticism!
Don't judge each day only by the harvest you reap, but also by the seeds you sow.
|
|
|
AirCowPeaCock
Hazard to Others
Posts: 311
Registered: 9-1-2012
Location: In your nation!
Member Is Offline
Mood: Hazardous
|
|
Thanks Bot0nist! Ill save that and use it next time I need isopropanol!(:
BOLD
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
