Arsenic Trichloride

Arsenic trichloride, also known as arsenous chloride or arsenic(III) chloride, is a chemical compound with the formula AsCl3. It is a colorless to yellowish liquid that has a pungent odor and is highly toxic.

Arsenic trichloride is prepared by heating arsenic with chlorine gas:

As + 3 Cl2 → AsCl3

Alternatively, it can be prepared by reacting arsenic trioxide with hydrochloric acid:

As2O3 + 6 HCl → 2 AsCl3 + 3 H2O

Arsenic trichloride is mainly used in organic chemistry as a reagent for the synthesis of various chemicals. It can be used as a chlorinating agent, as well as a reducing agent or a Lewis acid catalyst.

Arsenic trichloride is highly toxic and can cause severe irritation to the skin, eyes, and respiratory system upon contact or inhalation. It can also be absorbed through the skin and mucous membranes, and chronic exposure can lead to serious health problems such as lung cancer, skin lesions, and neurological damage. Therefore, it should be handled with extreme care in a well-ventilated area and protective equipment should be worn at all times.