4 CaI22 + 5 H2SO4 → 4 CaSO4 + H2S + 44 I2 + 4 H2O
This is an oxidation-reduction (redox) reaction:
SVI + 8 e- → S-II (reduction)
88 I-I - 88 e- → 88 I0 (oxidation)
4 CaXXII + 80 e- → 4 CaII (reduction)
H2SO4 is an oxidizing agent, CaI22 is a reducing agent, CaI22 is an oxidizing agent.
Reactants:
Products:
- CaSO4
- 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.]
- I2
- H2O – Water, oxidane