eriment 14 Exp etics and Rate Laws Kiir Objectives To use a spectrometer to dete
ID: 1063059 • Letter: E
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eriment 14 Exp etics and Rate Laws Kiir Objectives To use a spectrometer to determine the concentration of dye in an unknown solution To determine the rate law for a chemical reaction Keywords Kinetics, Rate Law, Rate Constant, Order of Reaction, Integrated Rate Law, Spectroscopy, Mass Percent. Background Much of your experience in chemistry laboratory deals with reactions that happen very quickly: acid- base neutralization, for example. Not all reactions are fast, and some are extremely slow. You can probably identify some slow reactions: the decomposition of fallen leaves, the rusting of iron in cars, or the rising of bread dough. The rate of a reaction is defined as the change of concentration (molL of one chemical species) as a function of time (seconds), just as the rate of a car moving down the road can be defined as the change in distance (miles) as a function of time (hours). For the generic reaction, A B products, the reaction rate can be written as: eq 14.1 Notice that since A is a reactant.IAldecreases over time and the numerator in the rate equation is negative. It is convention that rates are always positive values, so a negative sign is placed before the fraction to give a positive value for the rate. The reaction rate frequently depends on the concentration of the reactants, so it is often more informative to write the rate law for the reaction. The rate law relates the rate to the concentrations of all reactants involved in the reaction. For the generic equation above, the rate law has the form: eq 14.2 This experiment is a modification from Arce, J.: Betancourt R Rivera, Y Pijem, J.J. Chem. Educ. 1998 75, 1142-1143.Explanation / Answer
5. Pseudo rate constant is the simplied form of rate constant in a multicomponent reaction which combines all the rate constants. It is determined by making one or more reactants as constant from the experiment and then determining the rate of reaction and thereby rate constant for it with only one component changing. This could be done of any number of reactants in a reaction system.
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