By M. Mortimer, P.G. Taylor
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Additional info for Chemical Kinetics and Mechanism
16, a plot of I/[ A ] versus t will be a straight line with slope = akK. So, a second-order integrated rate equation also provides a convenient graphical means of determining the value of an experimental rate constant. As you can see, the method involves the use of reciprocal concentration. 2 to determine the value of the experimental rate constant kR for this decomposition. 55 Determining reaction order The most important use of integrated rate equations is in the determination of values for experimental rate constants.
In the sections that follow we shall take a closer look at the steps in the flow diagram. It should be emphasized, however, that the diagram is no more than an outline. Depending on circumstances, different routes can be taken to gain information about experimental rate equations and we shall mention some of these in our discussion. One key strategic point is to distinguish between reactions that involve either a single reactant or several reactants. The case of a reaction involving a single reactant provides the best starting point for discussion.
A> 2H2(g>+ 2NO(g) = 2H20(g>+ N,(g) (b) S20g2-(aq)+ 3I-(aq) = 2S04”(aq) + 13-(aq) The determination of reaction stoichiometry is a very important preliminary activity in any kinetic investigation. A kinetic reaction profile is a plot of the concentrations of reactants or products in a reaction, individually or combined, as a function of time under isothermal conditions. If the same stoichiometry for a reaction applies throughout the whole course of a reaction then the reaction is said to have time-independent stoichiometry.