Solubility rules

[Sublimation]

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Ok so i took a kap test not long ago and i encountered a problem that had asked which of the following has the lowest freezing point. and it had given me the Ksp values. Thing is i kno how to get the right answer. The one that dissociates the most will have lowest freezing point. Now here is my problem with the qs. The Ksp's were for insoluble compounds. Like PbBr2 ??????? What do i do???

 

[DrSpeed]

were they all the same solvent or different solvents? If the solvents are the same, the greater the solute dissociates the more the freezing point is depressed.

 

[Sublimation]

were they all the same solvent or different solvents? If the solvents are the same, the greater the solute dissociates the more the freezing point is depressed.

It just gave me the Ksp for 4 of them im assuming that they are in the same solvent considering the fact that they didnt mention anything. well since you put it like that i think i get it lol. i assumed it was in water and forgot that it could be in any solvent its just how much it dissociates. Thanks