4 BF₃ + 3 H₂O → 3 [BF₄]^- + 3 H⁺ + H₃BO₃

This is a complexation reaction: [BF₄]^- is the formed complex.

Reactants:

• BF₃
  • Names: Boron trifluoride , Boron fluoride , Trifluoroborane ... show moreBortrifluorid , Trifluoroboron , [BF3] , BF3 show less
  • Appearance: Colorless gas (anhydrous) | colorless liquid (dihydrate) ; Colourless compressed gas with pungent odour. forms white fumes in moist air ; Colorless gas with a pungent, suffocating odor. [Note: Forms dense white fumes in moist air. Shipped as a nonliquefied compressed gas.]
• H₂O – Water, oxidane
  • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide ... show moreDihydrogen monoxide (DHMO) (systematic name) , Hydrogen monoxide , Dihydrogen oxide , Hydric acid , Hydrohydroxic acid , Hydroxic acid , Hydrol , Μ-oxido dihydrogen , Κ1-hydroxyl hydrogen(0) show less
  • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas

Products:

• [BF₄]^-
• H⁺
• 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