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Homework Help: Finding Activation Energy From Arrhenius Plot

  1. Apr 10, 2008 #1
    1. The problem statement, all variables and given/known data

    For a lab, I need to find the activation energy of an experiment from plotting the Arrhenius plot. I have the half-life time of the reaction at various temperatures.

    2. Relevant equations

    -Temperature (K)

    -ln k

    3.145 x 10^-3
    3.106 x 10^-3
    3.058 x 10^-3
    3.021 x 10^-3
    2.956 x 10^-3

    3. The attempt at a solution

    So far I've plotted ln k vs 1/T.
  2. jcsd
  3. Apr 10, 2008 #2
    Ok forget that. why would the concentration of H2O be ignored in a rate law reaction?
    Last edited: Apr 10, 2008
  4. Apr 11, 2008 #3


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    Science Advisor
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    Gold Member

    It would be ignored if the rate of the reaction was independent of H2O concentration.
  5. Apr 11, 2008 #4
    Because it is a (l) and we only consider the concentrations of (aq) solutions.
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