flakten
Harmless
Posts: 12
Registered: 16-5-2012
Member Is Offline
Mood: No Mood
|
|
NO2 => HNO3 ?
Hi, I'm new on the forum so I hope this post went in the right place.
I'm doing some research (library and a bit of internet searching) on the subject NO2 and N2O4
I've hit a snag, question; how do you proceed with making liquid N2O4 (NO2 respectively) into nitric acid. I am uncertain of the
energy and entropy of the reactions. Several reactions have been suggested to me:
1.Add liquid NO2 to distilled water, this should result in 2 NO2 + 2 H2O => 2 H2NO3 => 2 H+ + 2HNO3-
2.Naa, that wont work, but if you heat it it will react as above
3.Naah, you need a catalyst as well, palatinum should work
4.Naah, you need to add it to hydrogen peroxide which per gram costs a fortune so it's not worth it. (H2O2 is only sold in 3% solution in EU, 500 g of
this costs 2 eur and {0,03*500 g =15 g, 2 eur / 0,015 Kg = 113 eur/Kg, i.e. a small fortune) 2 NO2 + 2 H2O2 => 2 H2NO3 + O2 => 2 HNO3- + 2 H+ +
O2
So now I need help, which of the above is true?
|
|
|
hissingnoise
International Hazard
Posts: 3940
Registered: 26-12-2002
Member Is Offline
Mood: Pulverulescent!
|
|
| Quote: | | I've hit a snag, question; how do you proceed with making liquid N2O4 (NO2 respectively) into nitric acid |
Being a mixed anhydride, chilled N<sub>2</sub>O<sub>4</sub> added to water would likely form a bottom layer of ~100%
HNO<sub>3</sub>; the top half should mostly consist of HNO<sub>2</sub> with dissolved NO<sub>2</sub>.
Dissolved NO<sub>2</sub> can be oxidised by sustained bubbling of dry air, or better, dry oxygen through the soln..
Do you have access to N<sub>2</sub>O<sub>4</sub> in quantity?
|
|
|
barley81
Hazard to Others
Posts: 481
Registered: 9-5-2011
Member Is Offline
Mood: No Mood
|
|
Here is information from "Absorption of Nitrous Gases" in the SM library:
[Edited on 17-5-2012 by barley81]
|
|
|
hissingnoise
International Hazard
Posts: 3940
Registered: 26-12-2002
Member Is Offline
Mood: Pulverulescent!
|
|
I'd expect stoichiometric quantities to react more or less as I've outlined . . .
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
