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:
- H2S – Hydrogen sulfide
- Other names: D
, Ihydrogen monosulfide|Dihydrogen sulfide|Sewer gas|Sulfane|Sulfurated hydrogen|Sulfureted hydrogen|Sulfuretted hydrogen|Sulfur hydride|Hydrosulfuric acid|Hydrothionic acid|Thiohydroxic acid|Sulfhydric acid}}
, Hydrosulfuric acid
- 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.]
- Other names: D
- 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.]
- Other names: Ferric oxide
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