Which of the following solutions will have the lowest vapor pressure?

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Q: Which of the following solutions will have the lowest vapor pressure?

Solution: MgCl2 dissociates into 3 ions, leading to the highest number of solute particles and thus the lowest vapor pressure.

Steps: 6

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.