What is the concentration of sodium ions in a 0.300 M NaCl solution?

• A. 0.600 M
• B. 0.300 M
• C. 0.150 M
• D. 0.100 M

Answer: (B)

Verified step by step guidance

1. Identify the compound given: NaCl (sodium chloride) is an ionic compound that dissociates completely in water into sodium ions (Na\textsuperscript{+}) and chloride ions (Cl\textsuperscript{-}).
2. Write the dissociation equation for NaCl in water: \(\mathrm{NaCl (s) \rightarrow Na^{+} (aq) + Cl^{-} (aq)}\).
3. Recognize that for every 1 mole of NaCl that dissolves, 1 mole of Na\textsuperscript{+} ions is produced because the stoichiometric ratio is 1:1.
4. Since the initial concentration of NaCl is 0.300 M and it dissociates completely, the concentration of Na\textsuperscript{+} ions will be equal to the initial concentration of NaCl.
5. Therefore, the concentration of sodium ions in the solution is 0.300 M.