This is an oxidation-reduction (redox) reaction:
2 PVIII + 6 e- → 2 PV (reduction)
3 Zn0 - 6 e- → 3 ZnII (oxidation)
PO4 is an oxidizing agent, Zn is a reducing agent.
Input interpretation
Zn + PO3-4 → Zn3(PO4)2
Zinc phosphate anion zinc anion
Zn + PO3-4 → Zn3(PO4)2
Zinc phosphate anion zinc anion