Final answer:
The solution with the highest concentration of Na+ ions is Option a: .15 M Na3PO4.
Step-by-step explanation:
To determine the solution with the highest concentration of Na+ ions, we need to compare the concentrations of Na+ ions in each solution. The concentration of Na+ ions can be determined by multiplying the molarity of the solution by the number of Na+ ions in the formula of the compound.
Looking at the options:
- Option a: .15 M Na3PO4
- Option b: .45 M NaNO3
- Option c: .35 M NaCl
- Option d: .25 M Na2SO4
Comparing the formulas of the compounds, we can see that:
- Na3PO4 has 3 Na+ ions
- NaNO3 has 1 Na+ ion
- NaCl has 1 Na+ ion
- Na2SO4 has 2 Na+ ions
Therefore, the solution with the highest concentration of Na+ ions is Option a: .15 M Na3PO4, as it has the highest number of Na+ ions.