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Nitric acid																				Related Pages
Synonyms & Trade Names
			Aqua fortis, Engravers acid, Hydrogen nitrate, Red fuming nitric acid, RFNA, White fuming nitric acid (WFNA)
CAS No.
			7697-37-2
	RTECS No.
			QU5775000
	DOT ID & Guide
			2031 157(other than red fuming)2032 157(fuming)

FormulaHNO3
	Conversion
			1 ppm = 2.58 mg/m3
	IDLH
			25 ppmSee: 7697372

Exposure Limits
			NIOSH RELTWA 2 ppm (5 mg/m3) ST 4 ppm (10 mg/m3)
					OSHA PEL TWA 2 ppm (5 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** 7903;**OSHA** ID165SG
					
					See: NMAM or OSHA Methods
										
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.]													
										
Molecular Weight63.0	
	Boiling Point181°F
	Freezing Point-44°F
	SolubilityMiscible
	Vapor Pressure48 mmHg
	Ionization Potential11.95 eV											
Specific Gravity(77°F): 1.50	
	Flash PointNA
	Upper Explosive LimitNA
	Lower Explosive LimitNA
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.]
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
										
Personal Protection/Sanitation
			(See protection codes) **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
			(See procedures)**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
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0183
					  MEDICAL TESTS: 0158

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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