-cyan-
Harmless
Posts: 13
Registered: 5-2-2007
Location: germany
Member Is Offline
Mood: No Mood
|
|
calcium azide
hi,
is it possible to form calciumazide by heating a mixture of Ca(NH2)2 with Ca(NO3)2 ? like the similar reaktion of sodiumamide with NaNO3 orwill the
Ca(N3)2 explode by heating it about 200°C ? Or maybe its possible to form the azide by heating Ca(NH2)2 in an N2O-stream?
thx&greetz
|
|
|
woelen
Super Administrator
Posts: 7976
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
Is azide formed from amide and nitrate? I always thought that nitrite is required instead of nitrate.
|
|
|
DeAdFX
Hazard to Others
Posts: 339
Registered: 1-7-2005
Location: Brothel
Member Is Offline
Mood: @%&$ing hardcore baby
|
|
The sodium amide reaction is the reaction between sodium amide and nitrous oxide not sodium nitrate. I have no clue what you would get from fusing
the two calcium salts together...
|
|
|
-cyan-
Harmless
Posts: 13
Registered: 5-2-2007
Location: germany
Member Is Offline
Mood: No Mood
|
|
the german wikipedia says this (maybe u don't understand the text but look at the equations):
http://de.wikipedia.org/wiki/Natriumazid
my problem is only that the azide of Na decomposes at a lower temperature than that of Ca and i dont know how violent the decomposition of Ca(N3)2 is.
|
|
|
Tsjerk
International Hazard
Posts: 3022
Registered: 20-4-2005
Location: Netherlands
Member Is Offline
Mood: Mood
|
|
Calciumazide will decompose above 110 degrees and explode above 160 degrees. This tempartures come from the book in the sciencemadness library about
inorganic azides.
|
|
|
-cyan-
Harmless
Posts: 13
Registered: 5-2-2007
Location: germany
Member Is Offline
Mood: No Mood
|
|
@tsjerk
whats the name of that book?
|
|
|
Tsjerk
International Hazard
Posts: 3022
Registered: 20-4-2005
Location: Netherlands
Member Is Offline
Mood: Mood
|
|
Hmmmm, I think I've got it somewhere else, but I don't remember where. Where could I upload it? Or if someone could do it for me you could send your
email by U2U and I could send it that way. It's 2,6mb and it's about energetic inorganic-azides. Very interesting.
|
|
|
woelen
Super Administrator
Posts: 7976
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
| Quote: | Originally posted by woelen
Is azide formed from amide and nitrate? I always thought that nitrite is required instead of nitrate. |
I must apologize for this. I have looked into this subject, and indeed, azide is made by fusing a mix of sodium amide and sodium nitrate, at a
temperature of around 175 C. So, I was wrong. The material need be dry though, no liquid water may be present, otherwise the amide is destroyed.
I don't think this will work for calcium instead of sodium, for two reasons:
1) The formation of azide will be above the decomposition temperature of calcium azide
2) Calcium nitrate is not Ca(NO3)2, but Ca(NO3)2.xH2O (IIRC x = 6, but it might also be 3, not sure about that). This salt will 'melt' in its own
water of crystallization and destroy the amide (giving ammonia).
Making anhydrous Ca(NO3)2 from the hydrated salt is not simply done by heating. Heating will result in expelling NO2 and O2, and calcium oxide and
calcium hydroxide will remain behind.
|
|
|
12AX7
Post Harlot
Posts: 4803
Registered: 8-3-2005
Location: oscillating
Member Is Offline
Mood: informative
|
|
Speaking of Ca(NO3)2 hydrations, I have a sample of salt that is most likely it. It is green from iron contamination. (Does iron really substitute
into calcium nitrate crystal? I'd be more inclined to believe magnesium, but the salt doesn't behave as magnesium nitrate ought to.) The sample had
been in exchange with basement air for some time, causing it to effloresce after crystallization. I recently dehydrated and weighed it, discovering
that, assuming Ca(NO3)2.xH2O as the formula, x = 2.98 (give or take 5% error from weighing). Apparently the 3- and 4-hydrates are known, and
accuracy in this difference is good enough that I think it dehydrated completely.
Tim
|
|
|
Nicodem
Super Moderator
Posts: 4230
Registered: 28-12-2004
Member Is Offline
Mood: No Mood
|
|
In this old thread there is a link to a paper discussing the thermal stability of calcium and other azides:
https://sciencemadness.org/talk/viewthread.php?tid=6586&...
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
