Which one of the following 0.06 M aqueous solutions has lowest freezing point?

Question

Canvas Classes · Accepted Answer

Strategy:
 Freezing point is a colligative property. Lowest freezing point corresponds to the highest depression in freezing point (), which is achieved by the solution with the highest total concentration of particles ().

Step 1: Analyze dissociation for each solute
1. :  ()
2. : Non-electrolyte ()
3. :  ()
4. :  ()

Step 2: Compare effective concentrations ()
Given  for all.
1. 
2. 
3. 
4.

Conclusion:
 has the highest effective concentration, thus the lowest freezing point.

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