Which of the following will exhibit the lowest vapor pressure?
Practice Questions
Q1
Which of the following will exhibit the lowest vapor pressure?
Pure water
0.1 M NaCl solution
0.1 M KCl solution
0.1 M glucose solution
Questions & Step-by-Step Solutions
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.
