H2SeO3 + 2 H2S → Se + 3 H2O + 2 S
This is an oxidation-reduction (redox) reaction:
SeIV + 4 e- → Se0 (reduction)
2 S-II - 4 e- → 2 S0 (oxidation)
H2SeO3 is an oxidizing agent, H2S is a reducing agent.
Reactants:
- H2SeO3 – Selenous acid
, Selenic(IV) acid
- 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
Products: