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

Printable Version  
Author: Subject: Liquid Nitrogen Dioxide Color
MrHomeScientist
International Hazard
*****




Posts: 1806
Registered: 24-10-2010
Location: Flerovium
Member Is Offline

Mood: No Mood

[*] posted on 26-12-2018 at 11:48
Liquid Nitrogen Dioxide Color


Recently Metallium put a really cool sample up for sale: a vial of liquefied NO2 encased in resin. There isn't a direct link, but it should appear at this page for a while: http://www.elementsales.com/newp_2017.htm

Here's the picture from that link:
rc-no2-1_np.JPG - 179kB

It's green! If you look at the image on wikipedia, however, it goes from dark brown to colorless depending on temperature:
https://en.wikipedia.org/wiki/Nitrogen_dioxide


What causes the green color?
View user's profile Visit user's homepage View All Posts By User
Ubya
International Hazard
*****




Posts: 1247
Registered: 23-11-2017
Location: Rome-Italy
Member Is Offline

Mood: I'm a maddo scientisto!!!

[*] posted on 26-12-2018 at 12:31


brown to colorless with green in between? that's odd, but cool sample anyway




---------------------------------------------------------------------
feel free to correct my grammar, or any mistakes i make
---------------------------------------------------------------------
View user's profile View All Posts By User
ninhydric1
Hazard to Others
***




Posts: 345
Registered: 21-4-2017
Location: Western US
Member Is Offline

Mood: Bleached

[*] posted on 26-12-2018 at 14:03


It looks like a mix of N2O3 (bluish tint when pure) and NO2, however, that would signify NO contamination, so I have no clue, unless the sample isn't pure.



The philosophy of one century is the common sense of the next.
View user's profile View All Posts By User
WGTR
National Hazard
****




Posts: 971
Registered: 29-9-2013
Location: Online
Member Is Offline

Mood: Outline

[*] posted on 26-12-2018 at 17:00


Here is a thread with the same question. I did a small experiment to show the production of N2O4 without significant contamination.

https://www.sciencemadness.org/whisper/viewthread.php?tid=93...

It's possible that the sample of NO2 from Metallium had enough moisture contamination to produce acid and NO, giving the green or blue coloration (depending on N2O3 concentration).

This is some N2O3 that I produced, sitting as a dense blue layer underneath some HNO3:

https://www.sciencemadness.org/whisper/viewthread.php?tid=84...

Basically, there's not quite enough oxygen in his sample to get the colorless or straw color.

[Edited on 12-27-2018 by WGTR]




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




Posts: 1806
Registered: 24-10-2010
Location: Flerovium
Member Is Offline

Mood: No Mood

[*] posted on 27-12-2018 at 11:03


Neat! That sounds very plausible. The dark blue of N2O3 mixed with brown NO2 would seem to explain it. I know NO2 goes from brown to colorless at low temperature, so I wonder if this sample would go from geeen to blue, or if the blue is also affected by temperature. That sounds like an interesting challenge to make pure, brown liquid NO2!
View user's profile Visit user's homepage View All Posts By User

  Go To Top