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7782-50-5

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Basic Information
CAS No.: 7782-50-5
Name: Chlorine
Molecular Structure:
Molecular Structure of 7782-50-5 (Chlorine)
Formula: Cl2
Molecular Weight: 70.91
Synonyms: Chlorinemol.;Chlorine molecule (Cl2);Diatomic chlorine;Dichlorine;Molecularchlorine;
EINECS: 231-959-5
Density: 1.382 g/cm3
Melting Point: -101 °C
Boiling Point: -34 °C
Flash Point:
Solubility: 0.7 g/100 mL in water
Appearance: light greenish-yellow gas with an irritating odour
Hazard Symbols: ToxicT,DangerousN
Risk Codes: 23-36/37/38-50
Safety: 9-45-61
Transport Information: UN 1017
PSA: 0.00000
LogP: 1.37900
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Consensus Reports

 Chlorine is reported in EPA TSCA Inventory. Community Right-To-Know List. EPA Extremely Hazardous Substances List.

Standards and Recommendations

OSHA PEL: TWA 0.5 ppm; STEL 1 ppm
ACGIH TLV: TWA 0.5 ppm; STEL 1 ppm; Not Classifiable as a Human Carcinogen
DFG MAK: 0.5 ppm (1.5 mg/m3)
NIOSH REL: (Chlorine) CL 0.5 ppm/15M
DOT Classification:  2.3; Label: Poison Gas

Analytical Methods

For occupational chemical analysis use OSHA: #ID-101 or NIOSH: Bromine and Chloride, 6011.

Specification

The IUPAC name of Chlorine is molecular chlorine. With the CAS registry number 7782-50-5, it is also named as Bertholite. The product's categories are Inorganics; Chemical Synthesis; Compressed and Liquefied Gases; Synthetic Reagents. Besides, it is light greenish-yellow gas with an irritating odour, which should be sealed in a cool, ventilated place. Chlorine gas reacts with most organic compounds, and will even sluggishly support the combustion of hydrocarbons. In addition, its molecular formula is Cl2 and molecular weight is 70.91.

The other characteristics of this product can be summarized as: (1)EINECS: 231-959-5; (2)ACD/LogP: 1.85; (3)# of Rule of 5 Violations: 0; (4)ACD/LogD (pH 5.5): 1.85; (5)ACD/LogD (pH 7.4): 1.85; (6)ACD/BCF (pH 5.5): 14.98; (7)ACD/BCF (pH 7.4): 14.98; (8)#H bond acceptors: 0; (9)#H bond donors: 0; (10)#Freely Rotating Bonds: 0; (11)Index of Refraction: 1.375; (12)Molar Refractivity: 11.74 cm3; (13)Molar Volume: 51.3 cm3; (14)Polarizability: 4.65×10-24cm3; (15)Surface Tension: 20.4 dyne/cm; (16)Density: 1.382 g/cm3; (17)Melting point: -101 °C; (18)Enthalpy of Vaporization: 20.41 kJ/mol; (19)Boiling Point: -34 °C; (20)Water solubility: 0.7 g/100 mL; (21)Vapour Pressure: 6450 mmHg at 25 °C.

Preparation of Chlorine: this chemical can be prepared by the electrolysis of sodium chloride dissolved in water in industry.
2 NaCl + 2 H2O → Cl2 + H2 + 2 NaOH

Uses of Chlorine: this chemical is used in making plastics, solvents for dry cleaning and metal degreasing, textiles, agrochemicals and pharmaceuticals, insecticides, dyestuffs, household cleaning products, etc. And it is an important chemical for water purification (such as water treatment plants), in disinfectants, and in bleach. Moreover, it can be used (in the form of hypochlorous acid) to kill bacteria and other microbes in drinking water supplies and public swimming pools. It has been used extensively in organic and inorganic chemistry as an oxidizing agent and in substitution reactions. It is also used in the production of chlorates and in bromine extraction.

When you are using this chemical, please be cautious about it as the following: it is toxic by inhalation, so please keep container in a well-ventilated place. It also irritates to eyes, respiratory system and skin. In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible). Moreover, it is very toxic to aquatic organisms. You should avoid release to the environment., and refer to special instructions / safety data sheets.

People can use the following data to convert to the molecule structure.
(1)Canonical SMILES: ClCl
(2)InChI: InChI=1S/Cl2/c1-2
(3)InChIKey: KZBUYRJDOAKODT-UHFFFAOYSA-N 

The toxicity data is as follows:

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
dog LCLo inhalation 800ppm/30M (800ppm) BEHAVIORAL: MUSCLE WEAKNESS

GASTROINTESTINAL: NAUSEA OR VOMITING

LUNGS, THORAX, OR RESPIRATION: DYSPNEA
Journal of Pharmacology and Experimental Therapeutics. Vol. 14, Pg. 65, 1919.
guinea pig LCLo inhalation 3200ppm/3H (3200ppm)   Archiv fuer Hygiene. Vol. 7, Pg. 231, 1887.
human LCLo inhalation 500ppm/5M (500ppm)   Tabulae Biologicae. Vol. 3, Pg. 231, 1933.
human LCLo inhalation 2530mg/m3/30M (2530mg/m3) LUNGS, THORAX, OR RESPIRATION: STRUCTURAL OR FUNCTIONAL CHANGE IN TRACHEA OR BRONCHI

LUNGS, THORAX, OR RESPIRATION: EMPHYSEMA

LUNGS, THORAX, OR RESPIRATION: CHRONIC PULMONARY EDEMA
"Chemicals in War," Prentiss, A.M., New York, McGraw Hill Book Co., 1937Vol. -, Pg. 150, 1937.
human TCLo inhalation 500ppb/2D-I (0.5ppm) BEHAVIORAL: TOLERANCE Journal of Applied Physiology. Vol. 54, Pg. 1120, 1983.
human TCLo inhalation 66ppm/1H (66ppm) BEHAVIORAL: HEADACHE

LUNGS, THORAX, OR RESPIRATION: COUGH

LUNGS, THORAX, OR RESPIRATION: DYSPNEA
Diagnostic Cytopathology. Vol. 4, Pg. 28, 1988.
mammal (species unspecified) LCLo inhalation 500ppm/5M (500ppm)   Naunyn-Schmiedeberg's Archiv fuer Experimentelle Pathologie und Pharmakologie. Vol. 138, Pg. 65, 1928.
mouse LC50 inhalation 137ppm/1H (137ppm)   Aerospace Medical Research Laboratory Report. Vol. TR-72-62, Pg. 1972,
rat LC50 inhalation 293ppm/1H (293ppm)   Aerospace Medical Research Laboratory Report. Vol. TR-72-62, Pg. 1972,