CAS CH 110 Lecture Notes - Lecture 28: Rate Equation, Reaction Rate Constant
25 Apr 2017
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Document Summary
In a stopped-flow experiment, the driving syringes on the left push reactant solutions into the mixing chamber, and the stopping syringe on the right stops the flow. The progress of the reaction is then monitored spectroscopically as a function of time. Though a computer can calculate tangent lines, we need to devise methods to determine the equations for these lines, which are called rate laws. There are two parts to every rate law. (1) how fast the line changes, or speed (initial rate) and (2) the shape of the line, called the rate law. To avoid complications, arising from products interfering with our measurements, observations are made in just the first few seconds of the beginning of the reaction (initial rates). For instance making five separate reactions with different concentrations: 2 n2o5(g) 4 no2 (g) + o2 (g). In each flask (reaction), after a few seconds we look to see how much of the reactants has disintegrated.
