Al₂O₃ (s) + 6 HF (aq) → 3 H₂O (l) + 2 AlF₃ (s)

This is an acid-base reaction (neutralization): Al₂O₃ is a base, HF is an acid.

Reactants:

• Al₂O₃
  • Names: Aluminium oxide (Aluminum oxide) , Aluminum oxide , Aluminium oxide ... show moreAlpha-Alumina , Alumina , Aluminum trioxide , Alpha-Aluminum oxide , Abramant , Abramax , Abrarex , Abrasit , Alcoa F 1 , Almite , Alon C , Aloxite , Cab-O-grip , Catapal S , Compalox , Conopal , Diadur , Dialuminum trioxide , Dispal alumina , Dispal M , Dural , Dotment 324 , Dotment 358 , Exolon XW 60 , Faserton , Fasertonerde , Hypalox II , Jubenon R , Ketjen B , Lucalox , Martoxin , Poraminar , Aluminum oxide [a-Alumina] , Aluminum trioxide [a-Alumina] , [Note: α-Alumina is the main component of technical grade alumina. Corundum is natural Al2O3. Emery is an impure crystalline variety of Al2O3.] show less
  • Appearance: White solid ; White powder ; White, odorless, crystalline powder.
• HF – Fluorane
  • Other names: Hydrofluoric acid , Hydrogen fluoride , Fluorhydric acid ... show moreHydronium fluoride , Hydrofluoric acid (70% aqueous solution) , Hydrofluoric acid, anhydrous , Anhydrous hydrogen fluoride , Aqueous hydrogen fluoride , HF-A show less
  • Appearance: Colorless solution ; Colourless gas or colourless liquid (below 19.5 °C) ; Colourless gas or colourless fuming liquid with pungent odour ; Colourless fuming liquid with pungent odour ; Colorless gas or fuming liquid (below 67°F) with a strong, irritating odor. [Note: Shipped in cylinders.]

Products:

• 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
• AlF₃
  • Names: Aluminium fluoride , Aluminium(III) fluoride , Aluminum trifluoride ... show moreAluminum fluoride , Aluminium fluoride (anhydrous) , Aluminum fluoride anhydre , Aluminium trifluoride show less
  • Appearance: White, crystalline solid | odorless ; Hygroscopic white or colourless crystals