2 Na2S-II + 2 O20 + H2O-II Na2S2IIO3-II + 2 NaO-IIH

This is an oxidation-reduction (redox) reaction:

2 S-II - 8 e- 2 SII (oxidation)

4 O0 + 8 e- 4 O-II (reduction)

Change the oxidation states