Na2Cr2O7 + 3 SO2 + H2SO4 → Na2SO4 + Cr2(SO4)3 + H2O
This is an oxidation-reduction (redox) reaction:
3 SIV - 6 e- → 3 SVI (oxidation)
2 CrVI + 6 e- → 2 CrIII (reduction)
SO2 is a reducing agent, Na2Cr2O7 is an oxidizing agent.
Reactants:
- Na2Cr2O7 – Sodium dichromate
- 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.]
- H2SO4 – Sulfuric acid
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