Final answer:
The molarity of Na+ ions in the 0.025 M NaCl solution is 0.025 M.
Step-by-step explanation:
The molarity of Na+ ions in a 0.025 M aqueous solution of NaCl can be calculated by considering that NaCl dissociates into one Na+ ion and one Cl- ion in aqueous solution.
Since NaCl is a 1:1 electrolyte, the molarity of Na+ ions will be the same as the overall molarity of the NaCl solution.
Therefore, the molarity of Na+ ions in the given solution is 0.025 M.