4 Na2S2O3 (aq) → 3 Na2SO4 (aq) + Na2S (aq) + 4 S (s)
This is an oxidation-reduction (redox) reaction:
4 SII + 8 e- → 4 S0 (reduction)
SII + 4 e- → S-II (reduction)
3 SII - 12 e- → 3 SVI (oxidation)
Na2S2O3 is both an oxidizing and a reducing agent (disproportionation (dismutation)).
This is a precipitation reaction: S is the formed precipitate.
Reactants:
- Na2S2O3
Products:
- Na2SO4
- Na2S
- S