Pre-Equil Approach

[Joseph Saba]

Does anyone know any book problem with a situation that we need to use this? The example in the book is the example we did in class. I also dont understand how to do number 14 on the "endgame" worksheet pertaining to this.

[005391550]

this method would be useful in the situation where the slow step rate law (which we assume to determine the overall rate law) includes an intermediate. Since we do not want intermediates in the overall rate law, we can use the pre-equilibrium approach to substitute out the intermediate

[Kevin Xu 4F]

There are two ways to find the combined rate law for an overall reaction, the steady state approach and the pre-equilibrium approach. The steady state approach is based on the assumption that the concentrations of the intermediates remain low and do not change significantly, and that the intermediate is so reactive that it reacts as soon as it is formed. The pre-equilibrium approach assumes that the intermediate is formed and sustained in a rapid formation reaction and its reverse, achieving a psuedo equilibrium state.