Question: Which of the following solutions will have the lowest vapor pressure?
Options:
0.1 M NaCl
0.1 M KBr
0.1 M MgCl2
0.1 M glucose
Correct Answer: 0.1 M MgCl2
Solution:
MgCl2 dissociates into 3 ions, leading to the highest number of solute particles and thus the lowest vapor pressure.
Which of the following solutions will have the lowest vapor pressure?
Practice Questions
Q1
Which of the following solutions will have the lowest vapor pressure?
0.1 M NaCl
0.1 M KBr
0.1 M MgCl2
0.1 M glucose
Questions & Step-by-Step Solutions
Which of the following solutions will have the lowest vapor pressure?
Correct Answer: MgCl2
Step 1: Understand what vapor pressure is. Vapor pressure is the pressure of a vapor in contact with its liquid or solid form. Lower vapor pressure means fewer molecules are escaping into the vapor phase.
Step 2: Know that when a substance dissolves in a solvent, it breaks into particles called solute particles. More solute particles in a solution lead to a lower vapor pressure.
Step 3: Look at the options given in the question. Identify which substances dissociate into more ions when they dissolve.
Step 4: For example, MgCl2 dissociates into 3 ions: 1 magnesium ion (Mg²⁺) and 2 chloride ions (Cl⁻). This means it creates 3 particles in solution.
Step 5: Compare this with other substances. If another substance dissociates into fewer ions, it will have a higher vapor pressure than MgCl2.
Step 6: Conclude that since MgCl2 produces the most particles, it will have the lowest vapor pressure among the options.
No concepts available.
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