Phosphorus trichloride

chemical compound

Phosphorus trichloride is a chemical compound. It is a molecular compound made up of phosphorus covalently bonded to three chlorine atoms. The phosphorus is considered to be in a 3+ oxidation state and each chlorine is considered to be in a 1- oxidation state. The chemical formula is PCl3.

Phosphorus trichloride structure
The bottle on the right has phosphorus trichloride in it.


It is a colorless liquid. It reacts with water to make phosphorous acid and hydrochloric acid. It is very toxic. It is a weak reducing agent.


It is made by reacting extra phosphorus with chlorine. It is used to make phosphorous acid industrially (in factories).


It is used to make organic compounds. It is also used to make other phosphorus compounds.

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