SiO₂ + 4 HF → SiF₄ + 2 H₂O

This is an acid-base reaction (neutralization): SiO₂ is a base, HF is an acid.

Reactants:

• SiO₂
• 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:

• SiF₄ – Tetrafluorosilane , Silicon tetrafluoride
  • Other names: Silicon fluoride , Fluoro acid air , Perfluorosilane
  • Appearance: Colourless gas, fumes in moist air ; Colourless gas with pungent odour
• 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