Which of the following has the lowest vapor pressure?
Practice Questions
Q1
Which of the following has 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 has 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 a solute (like NaCl or KCl) to water decreases its vapor pressure. This is because solute particles take up space and reduce the number of water molecules that can escape into the vapor phase.
Step 3: Compare the solutions. A 0.1 M NaCl solution and a 0.1 M KCl solution both have solute particles that lower the vapor pressure compared to pure water.
Step 4: Remember that the more solute particles present, the lower the vapor pressure will be. Since both NaCl and KCl dissociate into ions in solution, they contribute to lowering the vapor pressure.
Step 5: Conclude that the 0.1 M NaCl and KCl solutions will have lower vapor pressures than pure water due to the presence of solute particles.
