P-->P2O5-->H3PO4-->Zn3(PO4)2-->Zn(OH)2-->ZnO
1)4P + 5O₂ = 2P₂O₅ 2)P₂O₅+3H₂O = 2H₃PO₄ 3)2H₃PO₄ + 3ZnCO₃ = Zn₃(PO₄)₂ + 2H₂CO₃ 4)Zn₃(PO₄)₂ + 6KOH = 3Zn(OH)₂ + 2K₃PO₄ 5)Zn(OH)₂ = ZnO + H₂O