| 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
1760 154 (</=40% acid)
2031 157 (>40% acid)
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 |
Conversion
1 ppm = 2.58 mg/m3 |
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.] |
Personal
Protection & Sanitation
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)
|
First
Aid
Eye: Irrigate immediately
Skin: Water flush immediately
Breathing: Respiratory support
Swallow: Medical attention immediately
|
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 |
| Exposure
Routes inhalation, ingestion, skin and/or eye contact |
| Symptoms
Irritation eyes, skin, mucous membrane; delayed pulmonary
edema, pneumonitis, bronchitis; dental erosion |
Target
Organs Eyes, skin, respiratory system, teeth
|
|
