Which of the following will have the lowest freezing point? A) 0.1 M NaCl will have the lowest freezing point. B) 0.1 M BaCl₂ will have the lowest freezing point. C) 0.1 M AlCl₃ will have the lowest freezing point. D) All of these will have the same freezing point.

Question

Quizplus · Accepted Answer

The freezing point depression of a solution is dependent on the number of particles in solution. AlCl3 (Aluminum chloride) dissociates into four particles (one Al3+ ion and three Cl- ions) in solution, which is more than the dissociation of NaCl into two particles (one Na+ ion and one Cl- ion) or BaCl2 into three particles (one Ba2+ ion and two Cl- ions). Therefore, a 0.1 M solution of AlCl3 will have the lowest freezing point due to the highest number of particles causing the greatest freezing point depression.

Which of the Following Will Have the Lowest Freezing Point