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Temperature affects on ka

  • 22-10-2009 6:45pm
    #1
    JSK 252
    Registered Users, Registered Users 2 Posts: 1,257 ✭✭✭


    How does temperature affect the dissociation constant of an acid?


Comments

  • #2
    cianl1
    Closed Accounts Posts: 336 ✭✭cianl1


    It shouldn't... At all, really. I could be wrong but as far as I know temperature does not effect Ka in the slightest. The only things that do effect it, off the top of my head, are isomerism and thermodynamic factors such as Gibb's Free Energy and the like.


  • #3
    Marvinthefish
    Registered Users, Registered Users 2 Posts: 193 ✭✭Marvinthefish


    Wikipedia says "All dissociation constants vary with temperature according to the Van't Hoff equation" (Section 2.5-Temperature dependence)

    Hmmm it's been ages since I looked at Van't Hoff. Note: Temperature is on both sides of the equation.

    adb9e54e0a61572662793883c93f5db0.png

    http://upload.wikimedia.org/math/a/d/b/adb9e54e0a61572662793883c93f5db0.png


  • #4
    SOL
    Registered Users, Registered Users 2 Posts: 1,155 ✭✭✭SOL


    and gibbs free enery is a function of temperature no?


  • #5
    cianl1
    Closed Accounts Posts: 336 ✭✭cianl1


    I did say I could be wrong.:D


  • #6
    Kevster
    Closed Accounts Posts: 2,980 ✭✭✭Kevster


    Why is Gibbs giving away free energy?; and who is he? lol

    Enzyme kinetics was one of 'my' areas in b iochemistry when I studied it. Temperature does indeed affect the Ka. I've always felt uncomfortable using the word 'constant' for this Ka number though because it varies like crazy even for the same molecule.


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