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Simplification of the Experimental Kinetics

It may be possible to convert a very complex reaction into a less complex system by appropriate choice of reaction conditions or analytical methods. Here are some possibilities. [Pg.78]

3 Neglect of the terminal stages of the reaction. Perhaps the kinetics become complicated only later in the reaction, when a slow process leading to a byproduct begins to become significant. If this last reaction is of no immediate interest, data collection may be terminated before it complicates the kinetic [Pg.78]

Change of reaction conditions to minimize kinetic complications. For example, if two parallel reactions have substantially different activation energies, their relative rates will depend upon the temperature. The reaction solvent, pH, and concentrations are other experimental variables that may be manipulated for this purpose. [Pg.79]

Choice of initial conditions. To give a very obvious example, in Chapter 2 we saw that a second-order reaction A -I- B — products could be run with the initial conditions Ca = cb, thus permitting a very simple plotting form to be used. For complex reactions, it may be possible to obtain a usable integrated rate equation if the initial concentrations are in their stoichiometric ratio. [Pg.79]


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