Hydrogen chloride
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Synonyms & Trade Names
Anhydrous hydrogen chloride; Aqueous hydrogen chloride (i.e., Hydrochloric acid, Muriatic acid)
[Note: Often used in an aqueous solution.]
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CAS No.
7647-01-0
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RTECS No.
MW4025000
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DOT ID & Guide
1050 125 (anhydrous)
1789 157 (solution)
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FormulaHCl
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Conversion
1 ppm = 1.49 mg/m3
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IDLH
50 ppm
See: 7647010
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Exposure Limits
NIOSH REL: C 5 ppm (7 mg/m3)
OSHA PEL: C 5 ppm (7 mg/m3)
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Measurement Methods
NIOSH 7903;
OSHA ID174SG
See: NMAM or OSHA Methods |
Physical Description
Colorless to slightly yellow gas with a pungent, irritating odor.
[Note: Shipped as a liquefied compressed gas.]
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MW: 36.5
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BP: -121°F |
FRZ: -174°F |
Sol(86°F): 67% |
VP: 40.5 atm |
IP: 12.74 eV |
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Fl.P: NA |
UEL: NA |
LEL: NA |
RGasD: 1.27 |
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| Nonflammable Gas |
Incompatibilities & Reactivities
Hydroxides, amines, alkalis, copper, brass, zinc
[Note: Hydrochloric acid is highly corrosive to most metals.] |
Exposure Routes
inhalation, ingestion (solution), skin and/or eye contact
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Symptoms
irritation nose, throat, larynx; cough, choking; dermatitis; solution: eye, skin burns; liquid: frostbite; in animals: laryngeal spasm; pulmonary edema
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Target Organs
Eyes, skin, respiratory system
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Personal Protection/Sanitation
(See protection codes)
Skin: Prevent skin contact (solution)/Frostbite
Eyes: Prevent eye contact/Frostbite
Wash skin: When contaminated (solution)
Remove: When wet or contaminated (solution)
Change: No recommendation
Provide: Eyewash (solution), Quick drench (solution), Frostbite wash |
First Aid
(See procedures)
Eye: Irrigate immediately (solution)/Frostbite
Skin: Water flush immediately (solution)/Frostbite
Breathing: Respiratory support
Swallow: Medical attention immediately (solution) |
Respirator Recommendations
NIOSH/OSHA Up to 50 ppm:
(APF = 10) Any chemical cartridge respirator with 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 = 25) Any powered, air-purifying respirator with cartridge(s) providing protection against the compound of concern*
(APF = 10) Any supplied-air respirator*
(APF = 50) Any self-contained breathing apparatus 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 acid gas canister
Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection |
| See also: INTRODUCTION
See ICSC CARD: 0163
See MEDICAL TESTS: 0116
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