Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Temperature of dilution

  1. Feb 11, 2014 #1
    Hi there

    If I have 2.5% H3PO4 at 353 degrees C and I need to bring the solution down to 100 degrees C only by adding any amount water, how do I go about the thermo calculation? I need final temperature and amount of water (thus final concentration... likely <0.1 M? ) Heat capacity approaches 1 as concentration approaches 0, and the heat of dilution approaches 0 in the same way. Thanks for any advice.
     
  2. jcsd
  3. Feb 12, 2014 #2

    Borek

    User Avatar

    Staff: Mentor

    That's just a heat balance, but as you start close to critical point the main problem is that the heat capacity changes. Instead of using q=mcΔT you need to use

    [tex]q = m\int c dT[/tex]

    and integrate from Tstart to Tfinal.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted
Similar Discussions: Temperature of dilution
  1. Dilutions question (Replies: 5)

  2. Acid dilution (Replies: 3)

  3. Dilution Question (Replies: 1)

  4. Dilution and strength (Replies: 2)

  5. Dilution question (Replies: 5)

Loading...