Arsenic trichloride is a colorless or yellowish liquid. It melts at -16°C and boils at 130.2°C. It reacts with water, similar to phosphorus trichloride, to make arsenous acid and hydrochloric acid. It makes fumes in moist air. It is highly toxic.
It is used to make other arsenic compounds. It is also used to make organo-arsenic compounds.