menchaca
Hazard to Self
Posts: 80
Registered: 12-3-2003
Member Is Offline
Mood: No Mood
|
|
dehidratant agent
what temperature would i need to get anhidrous Na2SO4 from Na2SO4.10H2O?
thanks!!
|
|
|
BromicAcid
International Hazard
Posts: 3246
Registered: 13-7-2003
Location: Wisconsin
Member Is Offline
Mood: Rock n' Roll
|
|
According to Hawley's Condensed Chemical Dictionary "mp 33 C (liquefies). Loses water of hydration at 100 C" So if you keep beating on
it with heat it will stay at about 100 C until it looses its' water of hydration and when it starts to rise there it will be the anhydrous solid
with the mp of 888C.
|
|
|
menchaca
Hazard to Self
Posts: 80
Registered: 12-3-2003
Member Is Offline
Mood: No Mood
|
|
ok thanks a lot!!! i wanted it for using as dehidratant agent to get >95%HNO3 from HNO3 68%
|
|
|
vulture
Forum Gatekeeper
Posts: 3330
Registered: 25-5-2002
Location: France
Member Is Offline
Mood: No Mood
|
|
I'm not sure if that'll work. If it would, the industry would be using it in huge amounts, since it's dirt cheap.
The main problem is that SO4 2- is basic enough to get protonated by HNO3. You'll get strange compounds in your reaction, something like NO3.HSO4
I guess.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
|
|
|
menchaca
Hazard to Self
Posts: 80
Registered: 12-3-2003
Member Is Offline
Mood: No Mood
|
|
then what can i do? i have no acces to a source of concentred sulfuric acid what other konds of dehidratant agents can i use?
|
|
|
JustMe
Hazard to Others
Posts: 111
Registered: 7-8-2003
Member Is Offline
Mood: No Mood
|
|
I don't have my books with me now, and I've done a little googling. Yep, you need concentrated sulfuric acid, allright.
However, if memory serves me correctly, phosphorus pentoxide ought to do it too. It's such a powerful dehydrating agent that it'll dehydrate
concentrated HNO3 to N2O5. So I would guess that it would pull most of the water out from less concentrated nitric acid to form phosphoric acid, which
has a much higher boiling point than the nitric. Anyway, this is just a presumption... never done this.
[Edited on 1-10-2003 by JustMe]
Gotta remember to spell. (edits)
[Edited on 1-10-2003 by JustMe]
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
