Hydrogen Chloride

CAS RN: 7647-01-0

Other Properties

Chemical/Physical Properties for Hydrogen chloride.
Property Value
Heat of fusion at -114.22 deg C 1.9924 kJ/mol
Triple point -114.25 deg C
Critical volume 0.069 L/mol
Critical density 424 g/L
Critical compressability factor 0.117
Enthalpy of formation at 198 K -92.312 kJ/mol
Dissociation energy at 298 K 431.62 kJ
Compressability coefficient 0.00787
Dipole moment 3.716 Cm
Ionization potential 20.51 J
Thermal conductivity 335 mW/m K (liquid at 118.16 K)
Density 1.045 g/cu cm (liquid at 118.16 K)
0.630 g/cu cm (liquid at 319.15 K
1.507 g/cu cm (solid, rhombic at 81 K)
1.48 g/cu cm (solid, cubic at 98.36 K)
1.469 g/cu cm (solid, cubic at 107 K)
Dielectric constant 14.2 (liquid at 158.94 K)
1.0046 (gas at 298.16 K)
Electrical conductivity 1.7X10-7 1/Ohm m at 158.94 K
3.5X10-7 1/Ohm m at 185.56 K
Conversion factor: 1 ppm = 1.49 mg/cu m /Hydrogen chloride/
A solution of hydrogen chloride gas in water; may be colored yellow by traces of iron, chlorine, and organic matter; fumes in air; freezing point: -17.14 deg C (10.81% solution); -62.25 deg C (20.69%); -46.2 deg C (31.24%); -25.4 deg C (39.17%); density (15 deg C/4 deg C): 1.05 (10.17% w/w solution); 1.010 (20%); 1.15 (29.57%);1.20 (39.11%); pH: 0.10 (1.0 N HCl); 1.10 (0.1 N HCl); 2.02 (0.01 N HCl); 3.02 (0.001 N HCl); 4.01 (0.0001 N HCl); index of refraction (1.0 N solution): 1.34168 18 deg C/D /Hydrochloric acid/
The aqueous solution is a strong acid. Corrosive fumes emitted on contact with air. Reacts violently with bases, oxidizers forming toxic chlorine gas. Reacts, often violently, with acetic anhydride, active metals, aliphatic amines, alkanolamines, alkylene oxides, aromatic amines, amides, 2-aminoethanol, ammonia, ammonium hydroxide, calcium phosphide, chlorosulfonic acid, ethylene diamine, ethyleneimine, epichlorohydrin, isocyanates, metal acetylides, oleum, organic anhydrides, perchloric acid, 3-propiolactone, uranium phosphide, sulfuric acid, vinyl acetate, vinylidene fluoride. Highly corrosive to most metals, forming flammable hydrogen gas. Attacks some plastics, rubber, and coatings.
Henry's Law constant = 2.04X10+6 mol/L atm (4.90X10-10 atm-cu m/mol) /Hydrochloric acid/
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