Fuming nitric acid

  • Nitric acid, mixture with nitrogen dioxide
Formula
HNO3 . xNO2
Structure
Description
Red, fuming liquid. Pungent odor.

Registry Numbers and Inventories.
CAS
8007-58-7
UN (DOT)
2032
Beilstein/Gmelin
171869 (G)

Properties.
Formula
HNO3 . xNO2
Melting point, °C
-51
Boiling point, °C
85
Vapor pressure, mmHg
51
Vapor density (air=1)
2.2
Density
1.5 g/cm3 (20 C)
Solubility in water
Miscible
pKa/pKb
Strong acid

Hazards and Protection.
Storage
Poison/corrosive area. Keep tightly closed and away from combustible materials. Refrigerate.
Handling
Handle in accordance with all current regulations and standards. Subject to storage regulations: U.S. OSHA 29 CFR 1910.101.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
ELIMINATE all ignition sources and ground all equipment used when handling the product. Avoid contact with spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. DO NOT GET WATER INSIDE CONTAINERS. Cover with DRY earth, DRY sand, or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Use clean non-sparking tools to collect material and place it into loosley covered plastic containers for later disposal.
Stability
May discolor on exposure to light.
Incompatibilities
Water, most metals, hydrogen sulfide, paper, wood, cotton, alkalis, carbonates, cyanides, diboranes.
Decomposition
Nitrogen oxides

Fire.
Fire fighting
Note: Most foams will react with the material and release corrosive/toxic gases. Small Fires: carbon dioxide (except for Cyanides), dry chemical, dry sand, alcohol-resistant foam. Large Fires: Water spray, fog or alcohol-resistant foam.
Fire potential
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Hazards
Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases. Reaction with water may generate much heat which will increase the concentration of fumes in the air. Contact with metals may evolve flammable hydrogen gas.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.

Health.
Exposure effects
   Ingestion
See Inhalation.
   Inhalation
TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns, or death.
   Skin
See Inhalation.
   Eyes
See Inhalation.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   Eyes
Immediately flush with running water for at least 20 minutes.

Transport.
UN number
2032
Response guide
Hazard class
8
PRTC
T
Packing Group
I