Na2S2O3 (aq) + 4 Cl2 (g) + 5 H2O (l) → 2 NaHSO4 (aq) + 8 HCl (aq)
This is an oxidation-reduction (redox) reaction:
2 SII - 8 e- → 2 SVI (oxidation)
8 Cl0 + 8 e- → 8 Cl-I (reduction)
Na2S2O3 is a reducing agent, Cl2 is an oxidizing agent.
Reactants:
Products:
- NaHSO4 – Sodium hydrogen sulfate
- HCl – Chlorane , Hydrogen chloride
- Other names: Hydrochloric acid , M , Uriatic acid
- Appearance: Colorless, transparent liquid, fumes in air if concentrated ; Colorless gas ; Colourless compressed liquefied gas with pungent odour ; Colorless to slightly yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]