P40 + 10 CuIISO4 + 16 H2O 10 Cu0 + 10 H2SO4 + 4 H3PVO4

This is an oxidation-reduction (redox) reaction:

4 P0 - 20 e- 4 PV (oxidation)

10 CuII + 20 e- 10 Cu0 (reduction)

Change the oxidation states