Which of the following will exhibit the lowest vapor pressure?

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Question: Which of the following will exhibit the lowest vapor pressure?

Options:

Correct Answer: 0.1 M NaCl solution

Solution:

The 0.1 M NaCl solution will exhibit the lowest vapor pressure due to the presence of more solute particles (2 ions per formula unit).

Which of the following will exhibit the lowest vapor pressure?

Which of the following will exhibit the lowest vapor pressure?

Step 1: Understand what vapor pressure is. Vapor pressure is the pressure of a vapor in contact with its liquid or solid form. It indicates how easily a substance can evaporate.
Step 2: Know that adding solute to a solvent (like water) lowers the vapor pressure of the solvent. This is called 'vapor pressure lowering'.
Step 3: Identify the solutions being compared. In this case, we have a 0.1 M NaCl solution and possibly other solutions.
Step 4: Recognize that NaCl (sodium chloride) dissociates into two ions when it dissolves in water: Na+ and Cl-. This means that for every formula unit of NaCl, there are 2 particles in solution.
Step 5: Compare the number of solute particles in each solution. The more particles there are, the lower the vapor pressure will be.
Step 6: Conclude that the 0.1 M NaCl solution has more solute particles (2 ions) compared to other solutions that may have fewer particles, leading to the lowest vapor pressure.

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