Question
Wed March 30, 2011 By: Pritish K

What is the reaction that takes place when Nitric Acid is exposed to moisture in air ?

Expert Reply
Sun April 03, 2011
Dear Student
 
The pure acid tends to give off white fumes when exposed to air, acid with dissolved nitrogen dioxide gives off reddish-brown vapors, leading to the common name "red fuming acid" or "fuming nitric acid".
 
4 HNO3 â†’ 2 H2O + 4 NO2 + O2
 
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