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Steady State Approximation and Reaction Mechanisms

  1. Dec 15, 2013 #1
    Hi,

    I need help determining which of the statements are true and false.

    http://imgur.com/9BC1Wqf

    I know this involves steady state approximation, but I find that when I try it I am never able to rid of all the intermediates.

    Please help

    Thanks
     
  2. jcsd
  3. Dec 15, 2013 #2

    epenguin

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    Last edited: Dec 16, 2013
  4. Dec 17, 2013 #3
    The way I start any problem like this is two write an equation for the time derivative d/dt of the concentration of each chemical species involved in terms of the concentrations of the various species and the reaction rate constants. Then, I set the time derivatives of the fast reactions equal to zero. This leads to algebraic expressions for the fast reactions. I then solve the algebraic equations for the concentrations of the short lived species (in this case free radicals) in terms of the long lived species concentrations. I then substitute the concentrations for the short lived species into the slow reaction time derivatives. This will always get you to where you want to be.

    Chet
     
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