nightflight
Hazard to Self
Posts: 82
Registered: 23-5-2006
Member Is Offline
Mood: pyrophoric
|
|
HNO3 -fumes?
Hi,
I´ve recieved a bottle, but unroftunately the label is gone,
I only know that it´s HNO3, but not the concentration.
It´s yellow, and there´re fumes coming out of it, when pened, could it be 65% or does only >90% HNO3 prodice fumes?
Thanks,
nightflight
|
|
|
YT2095
International Hazard
Posts: 1091
Registered: 31-5-2003
Location: Just left of Europe and down a bit.
Member Is Offline
Mood: within Nominal Parameters
|
|
65% will fume also, it`s a reaction with air moisture that causes it.
if it`s Yellow though, it`s either quite old and been poorly stored, or it`s at a higher conc.
\"In a world full of wonders mankind has managed to invent boredom\" - Death
Twinkies don\'t have a shelf life. They have a half-life! -Caine (a friend of mine)
|
|
|
unionised
International Hazard
Posts: 5128
Registered: 1-11-2003
Location: UK
Member Is Offline
Mood: No Mood
|
|
Weigh a known volume of it and look it up in density tables or, to get better precision with more hassle, titrate it.
|
|
|
Furch
Hazard to Others
Posts: 130
Registered: 8-10-2006
Member Is Offline
Mood: No Mood
|
|
60% HNO3 also fumes... The only reliable way to know the concentration is to titrate it with a base of known concentration.
\"Those who say do not know, those who know do not say.\" -Lao Tzu
|
|
|
garage chemist
chemical wizard
Posts: 1803
Registered: 16-8-2004
Location: Germany
Member Is Offline
Mood: No Mood
|
|
Distill it and note the boiling point/curve. This will show if you have 65 or 99% acid and is easier and faster that titration or density
determination.
Azeotropic HNO3 will boil at 121°C, anhydrous HNO3 at 83°C.
[Edited on 22-3-2007 by garage chemist]
|
|
|
Fleaker
International Hazard
Posts: 1252
Registered: 19-6-2005
Member Is Offline
Mood: nucleophilic
|
|
I don't know how slow you are with a titration, but if you have a standard base and the proper indicator and equipment, it's definitely the way to go.
Get four good numbers on it and one can easily determine from there. Much faster than heating up nitric acid.
Neither flask nor beaker.
"Kid, you don't even know just what you don't know. "
--The Dark Lord Sauron
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
