1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Cause of melting point depression

Tags:
  1. Jul 6, 2009 #1
    1. The problem statement, all variables and given/known data

    An unknown compound gave a melting point of 230C. When the molten liquid solidified the melting point was determined to be 131C. Give a possible explanation for this discrepancy.

    2. Relevant equations



    3. The attempt at a solution

    I understand that melting point depression arises from impurities within the lattice of the crystallized sample. But, I cannot seem to find why re-melting a "used" MP sample would lead to a MP depression. Most likely the sample was not cooled quickly, but slowly sitting at room temperature, which should allow the crystal lattice to recombine without any impurities within the capillary tube. Any ideas?
     
  2. jcsd
  3. Jul 7, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    Have you ever seen what happens to sucrose when it is heated to melting?
     
  4. Jul 7, 2009 #3

    chemisttree

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Have you heard of polymorphism?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Cause of melting point depression
  1. Melting point (Replies: 3)

  2. Melting point (Replies: 8)

  3. Melting points (Replies: 3)

  4. Melting Points (Replies: 12)

Loading...