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.
- H2S – Hydrogen sulfide
- Other names: Dihydrogen monosulfide , Dihydrogen sulfide , Sewer gas
- Appearance: Colorless gas ; Colourless compressed liquefied gas with characteristic odour of rotten eggs ; 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.]
- Fe2O3 – Iron(III) oxide
- Other names: Ferric oxide , Hematite , Ferric iron
- Appearance: Red-brown solid ; Reddish brown-to-black crystals or powder ; Reddish-brown solid. [Note: Exposure to fume may occur during the arc-welding of iron.] ; A fine, red powder of ferric oxide. [Note: Usually used in cake form or impregnated in paper or cloth.]
- H2O – Water, oxidane