order of reaction~


10+ Year Member
Jun 12, 2006
  1. Pre-Dental
    A reaction was found to have a half life that depended on the initial concentration of the reactant. For this reaction, which one of the following plots might be linear?

    a. ln[A] vs. t
    b. 1/[A] vs. t
    c. both plots are linear.
    d. neither plot is linear


    Membership Revoked
    10+ Year Member
    7+ Year Member
    Nov 6, 2006
    1. Dental Student
      Well, we know that first order (choice a) is out of the question since it doesn't depend on initial concentration. Remember the equation for a first order process -2.3log(N/N') = kt initial concentrations will cancel out with substitution. Or you can just use 0.7/k = half life. Second order half life does depend on initial rate. I'd go with choice b which is the linear format for a second order reaction.

      1/[A] - 1/[A]' = kt
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