5 Cu0 + 4 H2SVIO4 Cu2IS-II + 3 CuIISVIO4 + 4 H2O

This is an oxidation-reduction (redox) reaction:

3 Cu0 - 6 e- 3 CuII (oxidation)

2 Cu0 - 2 e- 2 CuI (oxidation)

SVI + 8 e- S-II (reduction)

Change the oxidation states