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HCl

Names IUPAC nameHydrogen chlorideSystematic IUPAC nameChloraneOther names Anhydrous hydrochloric acidHydrochloric acid gasHydrochloric gasHydrochlorideIdentifiers CAS Number7647-01-03D model (JSmol)Interactive imageBeilstein Reference1098214 ChEBICHEBI:17883ChEMBLChEMBL1231821ChemSpider307ECHA InfoCard100.028.723EC Number231-595-7Gmelin Reference322 KEGGD02057MeSHHydrochloric+acidPubChemCID313RTECS numberMW4025000UNIIQTT17582CBUN number1050 CompTox Dashboard(EPA)DTXSID2020711InChIInChI=1S/HCl/h1HKey: VEXZGXHMUGYJMC-UHFFFAOYSA-NInChI=1/HCl/h1HKey: VEXZGXHMUGYJMC-UHFFFAOYATSMILESClProperties Chemical formulaHCl Molar mass36.46 g·mol Appearance Colorless gas Odorpungent; sharp and burning Density1.49 g/L Melting point−114.22 °C (−173.60 °F; 158.93 K) Boiling point−85.05 °C (−121.09 °F; 188.10 K) Solubility in water823 g/L (0 °C) 720 g/L (20 °C) 561 g/L (60 °C) Solubilitysoluble in methanol, ethanol, ether and waterVapor pressure4352 kPa (at 21.1 °C) Acidity (pKa) −3.0; −5.9 (±0.4) Basicity (pKb) 17.0 Conjugate acidChloroniumConjugate baseChlorideRefractive index (nD)1.0004456 (gas) 1.254 (liquid) Viscosity0.311 cP (−100 °C) Structure Molecular shapelinear Dipole moment1.05 D Thermochemistry Heat capacity(C)0.7981 J/(K·g) Std molarentropy(S298)186.902 J/(K·mol) Std enthalpy offormation(ΔfH298)−92.31 kJ/mol Std enthalpy ofcombustion(ΔcH298)−95.31 kJ/mol Pharmacology ATC codeA09AB03 (WHO) B05XA13 (WHO) Hazards Occupational safety and health (OHS/OSH): Main hazardsToxic, corrosive GHS labelling: PictogramsSignal wordDangerHazard statementsH314, H331Precautionary statementsP261, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338, P410+P403NFPA 704 (fire diamond) 301CORLethal 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/m) REL (Recommended)C 5 ppm (7 mg/m) IDLH (Immediate danger)50 ppm Related compounds Related compoundsHydrogen fluorideHydrogen bromideHydrogen iodideHydrogen astatideExcept where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Nverify ( ?)

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