Phosphoric acid, which is commonly used as rust inhibitor, food additive and etching agent for dental and orthopedic use, can be synthesized using a two-step thermal process. in the first step, phosphorus and oxygen react to form diphosphorus pentoxide: p4(l)+5o2(g-2 p20s(g) in the second step, diphosphorus pentoxide and water react to form phosphoric acld p20(9)+3 h200 2h, po40) write the net chemical equation for the production of phosphoric acid from phosphorus, oxygen and water. be sure your equation is balanced.