Na3PO4：Na3PO4 is a salt composed of three sodium cations (Na+) and one phosphate anion (PO43-).

NaPO3：NaPO3 is a salt composed of one sodium cation (Na+) and one phosphate anion (PO33-).

Na4P2O7：Na4P2O7 is a salt composed of four sodium cations (Na+) and two orthophosphate anions (P2O74-).