1. Understand the Formula:

* Na₃PO₄ represents sodium phosphate. It contains 3 sodium ions (Na⁺) for every one phosphate ion (PO₄³⁻).

2. Calculate Moles of Na₃PO₄:

* Molarity (M) is moles of solute per liter of solution.

* Moles of Na₃PO₄ = Molarity × Volume

* Moles of Na₃PO₄ = 0.300 M × 2.50 L = 0.750 moles

3. Calculate Moles of Na⁺:

* Since there are 3 sodium ions per formula unit of Na₃PO₄:

* Moles of Na⁺ = 3 × Moles of Na₃PO₄

* Moles of Na⁺ = 3 × 0.750 moles = 2.25 moles

Answer: There are 2.25 moles of sodium ions present in 2.50 L of 0.300 M Na₃PO₄ solution.