Which of the following has the highest freezing point depression?

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Q: Which of the following has the highest freezing point depression?

Solution: CaCl2 dissociates into 3 ions (Ca2+ and 2 Cl-), resulting in the highest freezing point depression.

Steps: 7

Step 1: Understand what freezing point depression means. It is the lowering of the freezing point of a solvent when a solute is added.
Step 2: Know that the freezing point depression depends on the number of particles (ions or molecules) the solute breaks into when dissolved in the solvent.
Step 3: Identify the solute in the question. In this case, we are looking at CaCl2.
Step 4: Determine how many ions CaCl2 dissociates into when it dissolves in water. CaCl2 breaks into 1 calcium ion (Ca2+) and 2 chloride ions (Cl-).
Step 5: Count the total number of ions produced by CaCl2. It produces 3 ions in total (1 Ca2+ and 2 Cl-).
Step 6: Compare this with other solutes (if provided) to see which one produces more ions. The more ions produced, the higher the freezing point depression.
Step 7: Conclude that since CaCl2 produces the most ions, it has the highest freezing point depression.