3 H2S + Fe2O3 3 H2O + S + 2 FeS

This is an acid-base reaction (neutralization): H2S is an acid, Fe2O3 is a base.

This is an oxidation-reduction (redox) reaction:

S-II - 2 e- S0 (oxidation)

2 FeIII + 2 e- 2 FeII (reduction)

H2S is a reducing agent, Fe2O3 is an oxidizing agent.

Reactants:

  • H2SHydrogen sulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Dihydrogen monosulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Dihydrogen sulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Sewer gas source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Colorless gas source: wikipedia, accessed: 2019-09-27; Colourless compressed liquefied gas with characteristic odour of rotten eggs source: ICSC, accessed: 2019-09-04; Colorless gas with a strong odor of rotten eggs. [Note: Sense of smell becomes rapidly fatigued & can NOT be relied upon to warn of the continuous presence of H2S. Shipped as a liquefied compressed gas.] source: NIOSH NPG, accessed: 2019-09-02
  • Fe2O3Iron(III) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-07
    • Other names: Ferric oxide source: wikipedia, accessed: 2019-09-27source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07source: NIOSH NPG, accessed: 2019-09-02, Hematite source: wikipedia, accessed: 2019-09-27, Ferric iron source: wikipedia, accessed: 2019-09-27
    • Appearance: Red-brown solid source: wikipedia, accessed: 2019-09-27; Reddish brown-to-black crystals or powder source: ICSC, accessed: 2019-09-04; Reddish-brown solid. [Note: Exposure to fume may occur during the arc-welding of iron.] source: NIOSH NPG, accessed: 2019-09-02; A fine, red powder of ferric oxide. [Note: Usually used in cake form or impregnated in paper or cloth.] source: NIOSH NPG, accessed: 2019-09-02

Products:

  • 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
  • S
    • Names: Sulfur source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04, S source: wikidata, accessed: 2019-09-07, Sulphur source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04
    • Appearance: Yellow solid in various forms source: ICSC, accessed: 2019-09-04
  • FeS
    • Names: Iron(II) sulfide source: wikipedia, accessed: 2019-09-27, Iron sulfide source: wikipedia, accessed: 2019-09-27, Ferrous sulfide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Appearance: Gray, sometimes in lumps or powder source: wikipedia, accessed: 2019-09-27