4 SO2 + 8 KOH → K2S + 3 K2SO4 + 4 H2O
This is an acid-base reaction (neutralization): SO2 is an acid, KOH is a base.
This is an oxidation-reduction (redox) reaction:
SIV + 6 e- → S-II (reduction)
3 SIV - 6 e- → 3 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.]
- KOH – Potassium hydroxide
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