Freezing Point depression of solutions with volatile solutes

[Nootropic]

I know that boiling points of solutions containing volatiles solutes are actually depressed, but would this imply that the freezing point of a solution (say, oh, containing methanol or ethanol) with a volatile solute would be elevated? I can't seem to find anything to guarantee my thinking. Anybody?

[ronthepon]

If you're adding Volatile chemical #2 to V.C.#1, then the resulting solution may have a higher vapour pressure.

 

That will only be when pure V.C.#2 has a greater Vapour pressure than pure V.C.#1

 

It's as simple as that. Assuming ideality in solution formation, addition of a more volatile solute will increase the vapour pressure.

[Nootropic]

I know the vapor pressure of the solution will increase, which in turn causes a decrease in boiling point ("boiling point depression") but I'm not sure if the increase in vapor pressure also causes an increase in the freezing/melting point of the solution ("freezing point elevation"). The solutions in question would be a water-ethanol and a water-methanol solution (water is the solvent); like I said, I know for sure that the boiling point is lower than that of pure water, but I don't know if the freezing point would be greater than that of pure water.