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Chemical Datasheet

CHROMIC ACID, SOLID
0
3 1
ox

Chemical Identifiers

UN/NA Number CAS Number CHRIS Code DOT Hazard Label
  • 1463
  • 7738-94-5
  • CMA
  • OXIDIZER
  • CORROSIVE
NFPA 704:
  • Red 0 -- Flammability: Will not burn
  • Blue 3 -- Health Hazard: Extremely hazardous - use full protection
  • Yellow 1 -- Reactivity: Unstable if heated - use normal precautions
  • White ox -- Special: Oxidizer
General Description
Chromic acid, solid is a dark purplish red solid. It is soluble in water with the release of heat. The material itself is noncombustible but it will accelerate the burning of combustible materials. Its solution is corrosive to metals and tissue.

Hazards

Reactivity Alerts
Air & Water Reactions
Water soluble.
Fire Hazard
Behavior in Fire: Containers may explode (USCG, 1999)
Health Hazard
Very irritating to eyes and respiratory tract. Ingestion causes severe gastrointestinal symptoms. Contact with eyes or skin causes burns; prolonged contact produces dermatitis (``chrome sores''). (USCG, 1999)
Reactivity Profile
A very powerful oxidizing agent, confirmed human carcinogen. Upon contact with reducing reagents it can cause a violent explosion, in contact with organic matter it may cause a violent oxidation leading to ignition. Dangerously reactive with acetone, alcohols, alkali metals (sodium, potassium), ammonia, arsenic, dimethylformamide, hydrogen sulfide, phosphorus, peroxyformic acid, pyridine, selenium, sulfur, and many other chemicals [Sax, 9th ed., 1996, p. 852]. When mixed with sulfuric acid for glass cleaning operations, used solution in closed bottle may explode due to internal pressure of carbon dioxide arising from contamination by carbon compounds [Bryson, W. R., Chem. Brit., 1975, 11, p. 377].
Belongs to the Following Reactive Group(s)

Response Recommendations

Firefighting
Flood with water. Apply water from as far a distance as possible. (AAR, 2003)
Non-Fire Response
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Neutralize spilled material with crushed limestone, soda ash, or lime. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Cover solids with a plastic sheet to prevent dissolving in rain or fire fighting water. Neutralize with agricultural lime (CaO), crushed limestone (CaCO3) or sodium bicarbonate (NaHCO3). Water spill: Neutralize with agricultural lime (CaO), crushed limestone (CaCO3), or sodium bicarbonate (NaHCO3). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates. (AAR, 2003)
Protective Clothing
Goggles and respirator. (Special chromic acid filters are available for respirators to prevent inhalation of dust or mist.) (USCG, 1999)
First Aid
INGESTION: call a physician; do NOT induce vomiting.

SKIN OR EYES: wash eyes thoroughly for at least 15 min.; flush contacted skin areas with water; remove contaminated clothing and wash before reuse. (USCG, 1999)

Physical Properties

Molecular Formula:
  • CrH2O4
Flash Point: data unavailable
Lower Explosive Limit: data unavailable
Upper Explosive Limit: data unavailable
Autoignition Temperature: May ignite organic materials on contact. (USCG, 1999)
Melting Point: data unavailable
Vapor Pressure: data unavailable
Vapor Density: data unavailable
Specific Gravity: 2.7 at 68.0 ° F (USCG, 1999)
Boiling Point: data unavailable
Molecular Weight: 100.01 (USCG, 1999)
Water Solubility: data unavailable
AEGL: data unavailable
ERPG: data unavailable
TEEL-1 TEEL-2 TEEL-3
0.339 mg/m3 6.0 mg/m3 34.0 mg/m3
(SCAPA, 2008)
IDLH: 15.0 mg/m3 As Cr(VI); A potential human carcinogen. (NIOSH, 2003)

Regulatory Information

Regulatory Names:
  • CHROMIC ACID
CAA RMP: Not a regulated chemical.
CERCLA: Regulated chemical with a Reportable Quantity of 10 pounds.
EHS (EPCRA 302): Not a regulated chemical.
TRI (EPCRA 313): Not a regulated chemical.
RCRA Chemical Code: none

Alternate Chemical Names