2 CaF2 + 2 H2SO4 + SiO2 2 CaSO4 + SiF4 + 2 H2O

This is an acid-base reaction (neutralization): H2SO4 is an acid, SiO2 is a base.

Reactants:

  • CaF2
    • Names: Calcium fluoride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Kalziumdifluorid source: wikidata, accessed: 2019-09-02, Kalziumfluorid source: wikidata, accessed: 2019-09-02
    • Appearance: White crystalline solid (single crystals are transparent) source: wikipedia, accessed: 2019-09-27; Colourless crystals or white hygroscopic powder source: ICSC, accessed: 2019-09-04
  • H2SO4Sulfuric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Oil of vitriol source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Sulfuric acid, concentrated (> 51% and < 100%) source: ICSC, accessed: 2019-09-04, H2SO4 source: wikidata, accessed: 2019-09-07
    • Appearance: Clear, colorless liquid source: wikipedia, accessed: 2019-09-27; Odourless colourless oily hygroscopic liquid source: ICSC, accessed: 2019-09-04; Colorless to dark-brown, oily, odorless liquid. [Note: Pure compound is a solid below 51°F. Often used in an aqueous solution.] source: NIOSH NPG, accessed: 2019-09-02
  • SiO2

    Products:

    • CaSO4
      • Names: Calcium sulfate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02, Plaster of Paris source: wikipedia, accessed: 2019-09-27, Drierite source: wikipedia, accessed: 2019-09-27
      • Appearance: White solid source: wikipedia, accessed: 2019-09-27; White hygroscopic powder or crystalline powder source: ICSC, accessed: 2019-09-04; Odorless, white powder or colorless, crystalline solid. [Note: May have blue, gray, or reddish tinge.] source: NIOSH NPG, accessed: 2019-09-02
    • SiF4Tetrafluorosilane source: wikipedia, accessed: 2019-09-28source: ICSC, accessed: 2019-09-04, Silicon tetrafluoride source: wikipedia, accessed: 2019-09-28source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04
      • Other names: Silicon fluoride source: wikipedia, accessed: 2019-09-28source: ICSC, accessed: 2019-09-04, Fluoro acid air source: wikipedia, accessed: 2019-09-28, Perfluorosilane source: ICSC, accessed: 2019-09-04
      • Appearance: Colourless gas, fumes in moist air source: wikipedia, accessed: 2019-09-28; Colourless gas with pungent odour source: ICSC, accessed: 2019-09-04
    • H2OWater, oxidane source: wikipedia, accessed: 2019-09-27
      • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
      • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27