The chemical process described here involves the oxidation of phosphorus (P) to form various phosphorus compounds.

Phosphorus (P) reacts with hydrogen gas (H2) to form phosphine gas (PH3).Phosphine gas (PH3) reacts with oxygen gas (O2) to form diphosphorus pentoxide (P2O5).Diphosphorus pentoxide (P2O5) reacts with water (H2O) to form phosphoric acid (H3PO4).Phosphoric acid (H3PO4) reacts with sodium hydroxide (NaOH) to form sodium phosphate (Na3PO4).Sodium phosphate (Na3PO4) reacts with calcium chloride (CaCl2) to form calcium phosphate (Ca3(PO4)2).

This chemical process involves the oxidation of phosphorus to form various phosphorus-containing compounds, each step building upon the previous one.