4 H2SO4 + 3 H2S + K2Cr2O7 → 7 H2O + K2SO4 + 3 S + Cr2(SO4)3
This is an oxidation-reduction (redox) reaction:
3 S-II - 6 e- → 3 S0 (oxidation)
2 CrVI + 6 e- → 2 CrIII (reduction)
H2S is a reducing agent, K2Cr2O7 is an oxidizing agent.
Reactants:
- H2SO4 – Sulfuric 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.]
- K2Cr2O7 – Potassium dichromate(VI)
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