Which aqueous solution has the lowest freezing point?

Question

Quizplus · Accepted Answer

The solution with the lowest freezing point will have the highest van't Hoff factor (i = number of particles after dissociation/number of particles before dissociation). CaBr2 will dissociate into 3 ions in water (Ca2+, 2Br-), while KCl will dissociate into 2 ions (K+, Cl-), HCl will dissociate into 2 ions (H+, Cl-), and ethanol will not dissociate. Therefore, CaBr2 will have the highest i value and therefore the lowest freezing point.

Which Aqueous Solution Has the Lowest Freezing Point