Finding Activation Energy From Arrhenius Plot

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Discussion Overview

The discussion revolves around the process of finding activation energy using an Arrhenius plot, specifically in the context of a lab experiment involving reaction kinetics. Participants explore the implications of temperature and concentration on reaction rates, as well as the relevance of certain components in rate laws.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant presents data from an experiment, including temperature and corresponding values of ln k and 1/T, indicating an attempt to plot these for analysis.
  • Another participant questions the rationale behind ignoring the concentration of H2O in a rate law reaction.
  • A response suggests that H2O concentration may be ignored if the reaction rate is independent of it.
  • Another participant adds that H2O is typically considered a liquid (l), and thus only the concentrations of aqueous (aq) solutions are relevant in rate laws.

Areas of Agreement / Disagreement

Participants express differing views on the treatment of H2O in rate laws, indicating that there is no consensus on this aspect of the discussion.

Contextual Notes

The discussion does not clarify the specific conditions under which H2O concentration may be considered negligible, nor does it resolve the implications of the Arrhenius plot data presented.

BayernBlues
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Homework Statement



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.

Homework Equations



-Temperature (K)
318
322
327
331
338

-ln k
-6.17
-5.89
-5.65
-5.33
-5.01

-1/T
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

The Attempt at a Solution



So far I've plotted ln k vs 1/T.
 
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Ok forget that. why would the concentration of H2O be ignored in a rate law reaction?
 
Last edited:
It would be ignored if the rate of the reaction was independent of H2O concentration.
 
Because it is a (l) and we only consider the concentrations of (aq) solutions.
 

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