Chemical Formula for Phosphorus Pentachloride

Phosphorus pentachloride is a greenish-yellow crystalline Solid Chemical compound with an irritating odour. It is decomposed by water to form hydrochloric and phosphoric acid and heat.

The Chemical Formula for Phosphorus Pentachloride is PCl₅

Phosphorous Pentachloride can be prepared by the action of dry chlorine on phosphorus trichloride.

Properties of Phosphorus Pentachloride

Chemical FormulaPCl5
AppearanceGreenish-yellow crystalline solid
Density2.1 g/cm³
Molecular Weight/ Molar Mass208.24 g/mol
Boiling Point166.8 °C
Melting Point160.5 °C
Other names Phosphorus (V) chloride, Pentachloro Phosphorane

Uses of Phosphorus Pentachloride – PCl5

  • Used as a chlorinating agent
  • Used as a catalyst in the manufacture of acetyl cellulose, the plastic film on which motion pictures are printed.
  • It is used in the manufacturing of penicillin and cephalosporin.
  • Used to produce acid chlorides.

Harmful effects of Phosphorus Pentachloride – PCl5

  •  It is corrosive to metals and tissue.
  • Long-term exposure to Phosphorus Pentachloride by inhalation can result in adverse health effects.