7784-34-1

  • English Name: Arsenic(III) Chloride
  • CAS Number: 7784-34-1
  • Molecular Formula: AsCl₃
  • Molecular Weight: 181.27

Physical Properties

  • Appearance: Colorless to pale yellow oily liquid.
  • Odor: Pungent and acrid.
  • Melting Point: -16°C.
  • Boiling Point: 130.2°C.
  • Density: 2.15 g/mL at 25°C.
  • Refractive Index: 1.6006 at 20°C.
  • Solubility: Decomposes in water to form arsenic acid (As(OH)₃) and hydrochloric acid (HCl); soluble in alcohol, ether, HCl, and HBr.
  • Vapor Pressure: 9.75 torr at 25°C.

Chemical Properties

  • Stability: Decomposes in water, forming hydrogen chloride (HCl) and arsenic acid (As(OH)₃).
  • Reactivity:
    • Reacts violently with active metals (e.g., sodium, potassium, aluminum) on impact.
    • Forms toxic fumes of hydrogen chloride and metallic arsenic when heated to decomposition.
    • Corrodes many metals in the presence of moisture.

Uses

  • Pharmaceuticals: Used as a chemical intermediate in the synthesis of organoarsenic compounds.
  • Agriculture: Used in the production of insecticides.
  • Ceramics: Used in the ceramic industry.
  • Other Applications: Used in the synthesis of chlorine-containing arsenicals.

Safety Information

  • Toxicity: Highly toxic by inhalation and ingestion.
  • Health Hazards: Causes severe irritation to skin, eyes, and mucous membranes. Inhalation or ingestion can lead to severe health effects, including hemorrhagic gastroenteritis and death.
  • First Aid:
    • Eye Contact: Rinse with water for at least 15 minutes and seek medical attention.
    • Skin Contact: Wash with soap and water and seek medical attention.
    • Inhalation: Remove from exposure and seek medical attention.
    • Ingestion: Do not induce vomiting; seek medical attention.
  • Storage: Store in a cool, dry, well-ventilated area, away from water, active metals, and strong oxidizers.

Environmental Information

  • Hazard Codes: T (Toxic), N (Hazardous to the environment).
  • Risk Statements: R23/25 (Toxic by inhalation and ingestion), R50/53 (Very toxic to aquatic life, may cause long-term adverse effects).
  • Safety Statements: S20/21 (Protect eyes and skin), S28 ( After contact with skin, wash immediately with plenty of soap and water), S45 (In case of accident or if you feel unwell, seek medical advice immediately).

Transport Information

  • UN Number: UN1560.
  • Hazard Class: 6.1 (Poison Inhalation Hazard).
  • Packing Group: I.

Waste Disposal

  • Consult with environmental regulatory agencies for guidance on acceptable disposal practices.

Packing and shipping