3 PH₃ + 4 HClO₃ → 3 H₃PO₄ + 4 HCl

This is an oxidation-reduction (redox) reaction:

PH₃ is a reducing agent, HClO₃ is an oxidizing agent.

Reactants:

• PH₃ – Phosphane
  • Other names: Phosphine , Phosphamine , Phosphorus trihydride ... show morePhosphorated hydrogen , Hydrogen phosphide , Phosphorus hydride , [PH3] , PH3 show less
  • Appearance: Colorless gas ; Colourless compressed liquefied gas ; Colorless gas with a fish- or garlic-like odor. [pesticide] [Note: Shipped as a liquefied compressed gas. Pure compound is odorless.]
• HClO₃
  • Names: Chloric acid , Chloric(V) acid , HClO3 ... show more[ClO2(OH)] , Chlorsäure , Chlorate show less
  • Appearance: Colourless solution

Products:

• H₃PO₄
  • Names: Phosphoric acid , Orthophosphoric acid , Phosphoric(V) acid ... show moreWhite phosphoric acid , [PO(OH)3] , H3PO4 , E338 , Phosphoric acid (aqueous) show less
  • Appearance: Hygroscopic colourless crystals ; Thick, colorless, odorless, crystalline solid. [Note: Often used in an aqueous solution.]
• HCl – Chlorane , Hydrogen chloride
  • Other names: Hydrochloric acid , M , Uriatic acid ... show moreHydronium chloride , Chlorhydric Acid , Hydrochloric acid gas , HCl , Anhydrous hydrogen chloride , Hydrochloric acid, anhydrous , Aqueous hydrogen chloride , [Note: Often used in an aqueous solution.] show less
  • Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]