2 SO2 + K2CrO4 + 4 KOH → K2CrO2 + 2 K2SO4 + 2 H2O
This is an oxidation-reduction (redox) reaction:
2 SIV - 4 e- → 2 SVI (oxidation)
CrVI + 4 e- → CrII (reduction)
SO2 is a reducing agent, K2CrO4 is an oxidizing agent.
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.]
- K2CrO4 – Potassium chromate
- KOH – Potassium hydroxide
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