11 P4 + 60 CuSO4 + 96 H2O → 20 Cu3P + 60 H2SO4 + 24 H3PO4
This is an oxidation-reduction (redox) reaction:
20 P0 + 60 e- → 20 P-III (reduction)
24 P0 - 120 e- → 24 PV (oxidation)
60 CuII + 60 e- → 60 CuI (reduction)
P4 is an oxidizing agent, P4 is a reducing agent, CuSO4 is an oxidizing agent.