Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    12
    ReputationRep:
    Can any of you clever physics types explain to me why the addition of solute depresses the freezing point (and elevates the boiling point) of solvents?

    As a humble chemist, all I was ever taught was that it happend, not why it happened...

    (rep for the best answer)

    Ta
    Offline

    2
    ReputationRep:
    (Original post by Plato's Trousers)
    Can any of you clever physics types explain to me why the addition of solute depresses the freezing point (and elevates the boiling point) of solvents?

    As a humble chemist, all I was ever taught was that it happend, not why it happened...

    (rep for the best answer)

    Ta
    I cant quite follow what theyre on about , but it might be of some help.
    http://en.wikipedia.org/wiki/Boiling-point_elevation
    http://en.wikipedia.org/wiki/Freezing_point_depression
    • Thread Starter
    Offline

    12
    ReputationRep:
    hmm...yeah. I read that, but it didn't make a lot of sense. I can see that a solute has a vapour pressure of zero, but why would that affect the vapour pressure of the solvent? Is it "taking up" some of the thermal energy in some way and not contribting to the vapour pressure? If so, how is it "taking up" that thermal energy?
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What newspaper do you read/prefer?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.