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Finding First Order Rxn Rate Constant

  1. Mar 31, 2009 #1
    1. The problem statement, all variables and given/known data

    I have a first order reaction where I need to find the rate constant. I have the following data:
    T = 30'C
    the slope of a graph with ln O.D vs T (minutes) is -0.008 so k is 0.008.

    3. The attempt at a solution

    I'm unsure about what reaction I would need here. This is for an acid sol'n (1 M H2SO4) mixed with a ferrous complex in a spectrophotometer with a 510 nm wavelength. I know there's the formula A = E*l*c where E is epsilon but I don't know how to determine the first order rate constant from this. For first order rate reactions: R = k[A] I know that k is 0.008 but I don't know how to get [A]
  2. jcsd
  3. Apr 2, 2009 #2


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    Isn't the rate constant simply k=0.008/min?
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