A student has prepared a 150.0 mL of 2.25 M Na3PO4. What is the chemical equation for the dissolving of Na3PO4 in water?

Answer 1

The chemical equation for the dissolution of Na3PO4 is the following:

Na₃PO₄(s) <===> 3Na⁺(aq) + PO₄^3-(aq)

The volume and concentration of the Na3PO4 does not affect the way in which the equation for dissolution is written. There may be a second part to the question asking about the concentration of each ion in solution, and that may be the reason for including the 150.0 ml and 2.25 M. Otherwise, these variables are not needed to answer this question.