| Nitric acid (HNO3), also known as aqua fortis and spirit of nitre, is a highly corrosive and toxic strong acid that can cause severe burns. The synthesis of nitric acid was first recorded circa 800 AD by the Muslim alchemist Jabir ibn Hayyan. |
| Nitric acid |
CAS 7697-37-2 |
| HNO3 |
RTECS QU5775000 |
Synonyms & Trade Names:
Aqua fortis, Engravers acid, Hydrogen nitrate, Red fuming nitric acid (RFNA), White fuming nitric acid (WFNA) |
DOT ID & Guide
2031 157 (other than red fuming)
2032 157 (fuming) |
Exposure
Limits:
NIOSH REL: TWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3) |
| OSHA PEL†: TWA 2 ppm (5 mg/m3) |
| IDLH
25 ppm
See: 7697372 |
Conversion
1 ppm = 2.58 mg/m 3 |
Physical Description
Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.] |
| MW:
63.0 |
BP:
181°F |
FRZ:
-44°F |
Sol:
Miscible |
| VP:
48 mmHg |
IP:
11.95 eV |
|
Sp.Gr
(77°F): 1.50 |
| Fl.P:
NA |
UEL:
NA |
LEL:
NA |
|
| Noncombustible Liquid, but increases the flammability of combustible materials. |
| Incompatibilities & Reactivities Combustible materials, metallic powders, hydrogen sulfide, carbides, alcohols [Note: Reacts with water to produce heat. Corrosive to metals.] |
Measurement Methods
NIOSH 7903; OSHA ID165SG
See: NMAM or OSHA Methods |
First Aid ( See procedures)
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
|
Personal Protection & Sanitation ( See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash (pH<2.5), Quick drench (pH<2.5)
|
Respirator Recommendations
NIOSH/OSHA
Up to 25 ppm:
(APF = 25) Any supplied-air respirator operated in a continuous-flow mode*
(APF = 50) Any chemical cartridge respirator with a full facepiece and cartridge(s) providing protection against the compound of concern¿
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern¿
(APF = 50) Any self-contained breathing apparatus with a full facepiece
(APF = 50) Any supplied-air respirator with a full facepiece
Emergency or planned entry into unknown concentrations or IDLH conditions:
(APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode
(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus
Escape:
(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern¿/Any appropriate escape-type, self-contained breathing apparatus
|
