Question: Which of the following will have the lowest vapor pressure?
Options:
Pure solvent
0.1 M NaCl
0.1 M KCl
0.1 M CaCl2
Correct Answer: 0.1 M CaCl2
Solution:
0.1 M CaCl2 produces the most particles in solution (3 ions), leading to the lowest vapor pressure.
Which of the following will have the lowest vapor pressure?
Practice Questions
Q1
Which of the following will have the lowest vapor pressure?
Pure solvent
0.1 M NaCl
0.1 M KCl
0.1 M CaCl2
Questions & Step-by-Step Solutions
Which of the following will have the lowest vapor pressure?
Correct Answer: 0.1 M CaCl2
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 when a solute is added to a solvent, the vapor pressure of the solvent decreases. This is called vapor pressure lowering.
Step 3: Recognize that the more particles a solute produces in solution, the greater the effect on lowering the vapor pressure.
Step 4: Identify the solute in the question. 0.1 M CaCl2 dissociates into 3 ions: 1 calcium ion (Ca²⁺) and 2 chloride ions (Cl⁻).
Step 5: Compare the number of particles produced by different solutes. Since CaCl2 produces 3 particles, it will lower the vapor pressure more than solutes that produce fewer particles.
Step 6: Conclude that 0.1 M CaCl2 will have the lowest vapor pressure because it produces the most particles in solution.
No concepts available.
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