colligative properties help

[darkhope]

---

Members don't see this ad.

Hey guys,
So anyone take a look at the kaplan books, because for some reason, some of their solutions attribute changes in colligative properties like boiling pt, due to intermolecular forces, eg: more hydrogen bonds? But i thought colligative properties don't depend on what the molecules are...
Thanks

 

[plzNOCarribbean]

you should think of colligative properties as being dependent on the NUMBER of particles being in solution. Hence why the boiling point elevation and freezing point depression have the term i, the vant hoff factor in them, which is a measure of the number of particles in solution. Thats how you should think of colligative properties.

Sure, I think the type of interaction can influence things like vapor pressure (like if the interaction between the compound added to solution and the solution was H-bonding as opposed to dipole-dipole, then yes it would affect these colligative properties) but more formally you should be concerned with the Number of particles in solution.