Effect of a soluble volatile impurity on the boiling point?

[a_zed24]

Hi everyone, just wanted to know how does a soluble, volatile impurity affect the boiling point of a liquid? I know it depends on the difference between the boiling points of the liquid and the impurity, but I'm afraid i still didn't get the point.
Thanks

 

[Ygggdrasil]

I'd suggest reading up on Raoult's Law in your chemistry text or taking a look at this page: http://www.chemguide.co.uk/physical/phaseeqia/idealpd.html#top

Feel free to ask more specific questions about the material here.