Final answer:
The student's question concerns the reaction of phosphoric acid with sodium hydroxide and the resulting mass of water produced. However, without a balanced chemical equation or further details on reaction conditions, an accurate solution cannot be provided.
Step-by-step explanation:
The student is asking about a chemical reaction involving phosphoric acid (H3PO4) and sodium hydroxide (NaOH). To find the mass of water (H2O) produced from the reaction of a given volume and concentration of H3PO4, we need to use stoichiometry. However, an actual chemical equation is needed to provide an accurate solution, which indicates how many moles of water are produced per mole of phosphoric acid. Without the balanced chemical equation, we cannot solve for the mass of water produced. Typically, phosphoric acid can react with NaOH in a stepwise manner, as it is a triprotic acid, and without specific reaction conditions or the balanced equation, we cannot accurately determine the mass of water produced.