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Arrhenius equation

  1. Nov 11, 2016 #1
    I know the Arrhenius equation is k=Ae^-Ea/RT
    The rate constant k is directly proportional to 1/t
    (t stands for the time for the reaction to reach a point)

    So I wonder if we can substitute k by 1/t in the Arrhenius equation to become 1/t=Ae^-Ea/RT ?

    Thanks a lot
  2. jcsd
  3. Nov 11, 2016 #2


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    Staff: Mentor

    The rate constant is a constant, it doesn't vary with time.
  4. Nov 11, 2016 #3
    My bad, I have made a mistake. It should be:

    The rate of reaction is directly proportional to both rate constant k and 1/t
    So are k and 1/t interchangeable in the Arrhenius equation?
  5. Nov 11, 2016 #4
    For the case that you mean something like this:

    [itex]\dot \xi = \frac{{\Delta \xi }}{{\Delta t}}[/itex]

    That is just an approximation (except for zero-order reactions).

    Accorting to the Arrhenius equation the rate constant is a function of temperature. If temperature changes over time than the rate constant changes over time too.
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