Which of the following solutions is the most concentrated?

• A. 0.75 M NaCl
• B. 1.0 M NaCl
• C. 0.25 M NaCl
• D. 0.50 M NaCl

Answer: (B)

Verified step by step guidance

1. Understand that concentration in this context refers to molarity (M), which is the number of moles of solute per liter of solution.
2. Look at each given solution's molarity: 0.75 M, 1.0 M, 0.25 M, and 0.50 M NaCl.
3. Compare the molarity values directly since they all refer to the same solute (NaCl) and are expressed in the same units (moles per liter).
4. Identify the solution with the highest molarity value, as this indicates the greatest number of moles of NaCl dissolved per liter of solution.
5. Conclude that the solution with the highest molarity is the most concentrated.