Hydrogen chloride
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| Names | |||
|---|---|---|---|
| IUPAC name
Hydrogen chloride | |||
| Systematic IUPAC name
Chlorane | |||
| Other names
Hydrochloric acid gas Hydrochloric gas Hydrochloride | |||
| Identifiers | |||
3D model (JSmol) |
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| 1098214 | |||
| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.028.723 | ||
| EC Number |
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| 322 | |||
| KEGG | |||
| MeSH | Hydrochloric+acid | ||
PubChem CID |
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| RTECS number |
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| UNII | |||
| UN number | 1050 | ||
CompTox Dashboard (EPA) |
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SMILES
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| Properties | |||
| HCl | |||
| Molar mass | 36.46 g/mol | ||
| Appearance | Colorless gas | ||
| Odor | pungent; sharp and burning | ||
| Density | 1.49 g/L | ||
| Melting point | −114.22 °C (−173.60 °F; 158.93 K) | ||
| Boiling point | −85.05 °C (−121.09 °F; 188.10 K) | ||
| 823 g/L (0 °C) 720 g/L (20 °C) 561 g/L (60 °C) | |||
| Solubility | soluble in methanol, ethanol, ether and water | ||
| Vapor pressure | 4352 kPa (at 21.1 °C) | ||
| Acidity (pKa) | −3.0; −5.9 (±0.4) | ||
| Basicity (pKb) | 17.0 | ||
| Conjugate acid | Chloronium | ||
| Conjugate base | Chloride | ||
Refractive index (nD) |
1.0004456 (gas) 1.254 (liquid) | ||
| Viscosity | 0.311 cP (−100 °C) | ||
| Structure | |||
Molecular shape |
linear | ||
| 1.05 D | |||
| Thermochemistry | |||
Heat capacity (C) |
0.7981 J/(K·g) | ||
Std molar entropy (S⦵298) |
186.902 J/(K·mol) | ||
Std enthalpy of formation (ΔfH⦵298) |
−92.31 kJ/mol | ||
Std enthalpy of combustion (ΔcH⦵298) |
−95.31 kJ/mol | ||
| Pharmacology | |||
| A09AB03 (WHO) B05XA13 (WHO) | |||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards |
Toxic, corrosive | ||
| GHS labelling: | |||
| Danger | |||
| H280, H314, H331 | |||
| P261, P280, P305+P351+P338, P310, P410+P403 | |||
| NFPA 704 (fire diamond) |
3
0
1 COR | ||
| Lethal dose or concentration (LD, LC): | |||
LD50 (median dose) |
238 mg/kg (rat, oral) | ||
LC50 (median concentration) |
3124 ppm (rat, 1 h) 1108 ppm (mouse, 1 h) | ||
LCLo (lowest published) |
1300 ppm (human, 30 min) 4416 ppm (rabbit, 30 min) 4416 ppm (guinea pig, 30 min) 3000 ppm (human, 5 min) | ||
| NIOSH (US health exposure limits): | |||
PEL (Permissible) |
C 5 ppm (7 mg/m3) | ||
REL (Recommended) |
C 5 ppm (7 mg/m3) | ||
IDLH (Immediate danger) |
50 ppm | ||
| Safety data sheet (SDS) | JT Baker MSDS | ||
| Related compounds | |||
Related compounds |
Hydrogen fluoride Hydrogen bromide Hydrogen iodide Hydrogen astatide | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references | |||
The compound hydrogen chloride has the chemical formula HCl and as such is a hydrogen halide. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric water vapor. Hydrogen chloride gas and hydrochloric acid are important in technology and industry. Hydrochloric acid, the aqueous solution of hydrogen chloride, is also commonly given the formula HCl.
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