SO2 (aq) + 2 NaClO3 (aq) → Na2SO4 (aq) + 2 ClO2 (g)
This is an oxidation-reduction (redox) reaction:
SIV - 2 e- → SVI (oxidation)
2 ClV + 2 e- → 2 ClIV (reduction)
SO2 is a reducing agent, NaClO3 is an oxidizing agent.
This is a gas evolution reaction, ClO2 is the formed gas.
- 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.]
- NaClO3 – Sodium chlorate
- ClO2 – Chlorine dioxide , 4-chlorane (substitutive) OR Dioxidochlorine(•) (additive) -->