2 H₃BO₃ + 3 PCl₅ → 3 POCl₃ + 6 HCl + B₂O₃

Reactants:

• H₃BO₃ – Boric acid , Trihydrooxidoboron
  • Other names: Orthoboric acid , Boracic acid , Sassolite ... show moreOptibor , Borofax , Trihydroxyborane , Boron(III) hydroxide , Boron Trihydroxide , O-boric acid , Hydrogen borate show less
  • Appearance: White crystalline solid ; Odourless colourless crystals or white powder
• PCl₅ – Phosphorus pentachloride , Phosphorus(V) chloride
  • Other names: Pentachlorophosphorane , Pentachlorophosphorus , Phosphoric chloride ... show morePhosphorus perchloride , [PCl5] , PCl5 show less
  • Appearance: Colourless crystals ; Fuming white-to-yellow crystals with pungent odour ; White to pale-yellow, crystalline solid with a pungent, unpleasant odor.

Products:

• POCl₃ – Phosphoryl trichloride
  • Other names: Phosphoryl chloride , Phosphorus oxychloride , Phosphoric trichloride ... show moreTrichlorophosphate , Phosphorous oxychloride , Phosphorus chloride , Phosphorus oxytrichloride , Phosphorus trichloride oxide , [PCl3O] , POCl3 , Phosphorus(V) trichloride oxide , Trichlorophosphorus oxide , Trichlorophosphine oxide , Phosphorus chloride [Phosphorus oxychloride] show less
  • Appearance: Colourless liquid, fumes in moist air ; Brown fuming liquid with pungent odour ; Clear, colorless to yellow, oily liquid with a pungent & musty odor. [Note: A solid below 34°F.]
• 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.]
• B₂O₃
  • Names: Boron trioxide , Boron oxide , Diboron trioxide ... show moreBoron sesquioxide , Boric oxide , Boria , Boric anhydride , B2O3 show less
  • Appearance: White, glassy solid ; White hygroscopic powder or granules ; Colorless, semitransparent lumps or hard, white, odorless crystals.