Chlorine

CAS RN: 7782-50-5

Other Properties

Heat capacity at constant pressure (gas, 25 deg C): 8.11 cal/mol deg C; critical density: 0.573; oxidizing agent; very reactive; reduction potential (aqueous): 1.356 V; dissociation energy: 57.978 kcal at 25 deg C; forms halides with all elements except the rare gases helium, neon, and argon; 1.4085 (liquid) at 20 deg C and 6.864 atm; 1.5649 (liquid) at -35 deg C and 0.9949 atm
Stable isotope abundance (atom, %): Cl-35, 75.53%; Cl-37, 24.47%; critical volume: 0.001745 cu m/kg; density: 3.213 kg/cu m at 0 deg C and 101.3 kPa; latent heat of vaporization, 287.75 J/g ;enthalpy of fusion: 90.33 kJ/kg; electron affinity: 3.77 eV; enthalpy of hydration of chloride ion: 405.7 kJ/mol; ionization energies: 13.01 eV; 23.80 eV; 39.9; 53.3; 67.8; 96.6, 114.2 eV; specific heat at constant pressure: 481 kJ/kg K; specific heat at constant volume: 0.357 kJ/kg K; specific magnetic susceptibility: -7.4X10-9 cu m/kg at 20 deg C; electrical conductivity of liquid at-70 deg C: 1X10-16 (Ohm cm)-1; dielectric constant at 0 deg C (wavelengths > 10 m): 1.97
Conversion factor: 1 ppm = 2.90 mg/cu m
Liquefaction pressure: 7.86 atm at 25 deg C; 1 atm at -35 deg C; strongly electronegative
Ratio of Specific Heats of Vapor (Gas): 1.325
Chlorine weighs 13 lb/gal
Diffusivity: 1.44X10-5 sq cm/sec in water at 25 deg C (calculated).
Saturation concentration: 882.3 g/cu m at -7 deg C.
Dielectric constant (gas): 1.0005480 at 101.325 kPa @ 20 deg C; dielectric constant (liquid): 1.454 @ 70.15 K
Volatility: 19,369,000 mg/cu m at 20 deg C; decomposition point: >1000 deg C;
Liquid; clear amber; very irritating odor; density: 1.56 at -35 deg C, freezing point: -101 deg C; 1 L liquid = 456.8 L gas at 0 deg C and 1 atm; very low electrical conductivity; soluble in chlorides and alcohols; extremely strong oxidizing agent; slightly soluble in cold water /Liquid/
Saturated vapor pressure: 74.040 lb/sq inch at 50 deg F
Saturated vapor density: 0.95960 lb/cu ft at 50 deg F
Ideal gas heat capacity: 0.114 btu/lb-deg F at 75 deg F
Diffusion coefficient: 0.033 sq m/hr at 0 deg c and 760 mm Hg (calculated)
Acts as electron-acceptor in forming complexes with many donor species: Bent, Chem Rev 68, 587 (1968); forms explosive mixtures with hydrogen; many finely divided metals will burn in an atmosphere of chlorine; oxides are strong oxidizing agents and explosive; monatomic chlorine is unstable under ordinary conditions, however, it can be formed as a result of thermal or optical dissociation, by an electrical discharge, or as an intermediate during chemical reactions
Chlorine persists as an element only at a very low pH (less than 2), and at the higher pH found in living tissue it is rapidly converted into hypochlorous acid. In this form, it apparently can penetrate the cell and form N-chloro-derivatives that can damage cellular integrity.
When chlorine gas (Cl2) is dissolved in water, it rapidly undergoes an oxidation-reduction reaction (disproportionation) to form hypochlorous acid (HOCl) and chloride ion (Cl-).
Henry's Law constant:0.0104 atm cu m/mol at 25 deg C
Hydroxyl radical reaction rate constant = 6.08X10-14 cu m/molec-sec at 25 deg C
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