2 OsF₆ + 6 H₂O → OsO₄ + OsO₂ + 12 HF

This is an oxidation-reduction (redox) reaction:

OsF₆ is both an oxidizing and a reducing agent (disproportionation (dismutation)).

Reactants:

• OsF₆ – Osmium(VI) fluoride
  • Other names: Osmium hexafluoride
  • Appearance: Yellow crystalline solid
• 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:

• OsO₄ – Osmium tetraoxide , Tetraoxoosmium
  • Other names: Osmium tetroxide , Osmium(VIII) oxide , Osmic acid anhydride ... show moreOsmium oxide , Perosmic oxide , Osmic acid , Perosmic acid anhydride , OsO4 show less
  • Appearance: White volatile solid ; Colourless-to-pale-yellow solid in various forms with pungent odour ; Colorless, crystalline solid or pale-yellow mass with an unpleasant, acrid, chlorine-like odor. [Note: A liquid above 105°F.]
• OsO₂
• 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.]