Understanding First Order Reaction Kinetics: Rate Equations and Graphical Analysis
Learn how to calculate the rate of a first-order reaction using the rate equation for dichloropropene. Discover how to plot concentration-time and rate-concentration graphs to determine the rate constant (k) and understand the reaction kinetics.
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Presentation Transcript
Rate Equations First order reaction kinetics
Calculating the rate of reaction dichloropropene Plot the concentration time graph using graph paper or excel. Measure the rate of reaction at least four different concentrations by drawing a tangent and measuring its gradient. Note: This slope should be given a negative value. This shows that the concentration of the reactant is decreasing. However, in rates of reaction work, we will ignore this.
Rate conc graph Plot a graph of rate v concentration. dichloropropene First order rate equations will give a straight line through the origin. The slope of the best fit line is the value of the rate constant for the reaction. If the graph is NOT linear then the reaction does NOT follow first order kinetics.
Rate equation dichloropropene Rate equation is Rate = k[P] Rate constant (k) is the slope of the graph = 5.5/80 5.5 Rate constant (k) = 0.069 d-1 80
