OsO4 + 4 FeCl2 + 6 NH4Cl + 8 HCl → (NH4)2[OsCl6] + 4 NH4[FeCl4] + 4 H2O

This is a complexation reaction: (NH4)2[OsCl6] andNH4[FeCl4] is the formed complex.

This is an oxidation-reduction (redox) reaction:

OsVIII + 4 e- → OsIV (reduction)

4 FeII - 4 e- → 4 FeIII (oxidation)

OsO4 is an oxidizing agent, FeCl2 is a reducing agent.

Reactants:

  • OsO4 – Osmium tetraoxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Tetraoxoosmium source: wikipedia, accessed: 2019-09-27
    • Other names: Osmium tetroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02, Osmium(VIII) oxide source: wikipedia, accessed: 2019-09-27, Osmic acid anhydride source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: White volatile solid source: wikipedia, accessed: 2019-09-27; Colourless-to-pale-yellow solid in various forms with pungent odour source: ICSC, accessed: 2019-09-04; Colorless, crystalline solid or pale-yellow mass with an unpleasant, acrid, chlorine-like odor. [Note: A liquid above 105°F.] source: NIOSH NPG, accessed: 2019-09-02
  • FeCl2 – Iron(II) chloride source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04, Iron dichloride source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04
    • Other names: Ferrous chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Rokühnite source: wikipedia, accessed: 2019-09-27, [FeCl3] source: wikidata, accessed: 2019-09-02, FeCl3 source: wikidata, accessed: 2019-09-02
    • Appearance: Tan solid (anhydrous) | Pale green solid (di-tetrahydrate) source: wikipedia, accessed: 2019-09-27; White-to-light-green hygroscopic crystals source: ICSC, accessed: 2019-09-04
  • NH4Cl – Ammonium chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Sal ammoniac source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Salmiac source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Nushadir salt source: wikipedia, accessed: 2019-09-27
    • Appearance: White solid, hygroscopic source: wikipedia, accessed: 2019-09-27; Odourless colourless-to-white hygroscopic solid in various forms source: ICSC, accessed: 2019-09-04; Finely divided, odorless, white particulate dispersed in air. source: NIOSH NPG, accessed: 2019-09-02
  • HCl – Chlorane source: wikipedia, accessed: 2019-09-27, Hydrogen chloride source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Hydrochloric acid source: wikipedia, accessed: 2019-09-27source: NIOSH NPG, accessed: 2019-09-02, M source: wikipedia, accessed: 2019-09-27, Uriatic acid source: wikipedia, accessed: 2019-09-27
    • Appearance: Colorless, transparent liquid, fumes in air if concentrated source: wikipedia, accessed: 2019-09-27; Colorless gas source: wikipedia, accessed: 2019-09-27; Colourless compressed liquefied gas with pungent odour source: ICSC, accessed: 2019-09-04; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02

Products:

  • (NH4)2[OsCl6]
  • NH4[FeCl4]
  • H2O – Water, 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