2 SO2 + K2Cr2O7 + 3 H2SO4 → Cr2(SO4)3SO4 + K2SO4 + 3 H2O
This is an oxidation-reduction (redox) reaction:
SIV + 2 e- → SII (reduction)
SIV - 2 e- → SVI (oxidation)
SO2 is both an oxidizing and a reducing agent (disproportionation (dismutation)).
Reactants:
- SO2 – Sulfur dioxide
- Other names: Sulfurous anhydride , Sulphur dioxide , Sulfurous acid anhydride
- Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]
- K2Cr2O7 – Potassium dichromate(VI)
- H2SO4 – Sulfuric acid
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