differences in solute physical properties in colligative prop

[ihatebluescrubs]

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I'm wondering if I have 2 different solutes (lets say NaCl vs NaI) at the same Molarity in the same amount of liquid. Will the freezing points differ?

I'm guessing that because NaCl has a smaller molecular weight (g/mol) so it will have more particles -->so it'll have a lower freezing point. Is this right?

 

[polyatomic]

Well, if you have 1 g of each, then NaCl would have more moles of compound (because it weighs less), so it would easily have a lower freezing point, or higher boiling point.

However, if you have 1 M NaI and NaCl, then you have the same number of particles for both, and this doesn't apply anymore. At that point, there's nothing to distinguish the two.