Lab 1: Bromination of Acetone
Table of contents
KINETICS OF BROMINATION OF ACETONE VIA UV-VIS SPECTROSCOPY
Studying kinetics of reaction. What makes it convenient to study the kinetics of this reaction via UV-Vis spectroscopy? Theory Spectroscopy. Beer’s Law Kinetics Reaction Mechanism Method and Instrumentation Experimental procedure incl. how solutions were prepared Description of instrument Data and Results (40) Tabulation of solutions used (3) Calibration curve for Bromine concentration. (9) How did you calculate the actual concentration of the most concentrated Br solution that you started out with? Correlation coefficient of the calibration curve? Needed to take out a point? Why? How? Did you set the intercept to zero? Why or why not? Determine the orders reaction with respect to the reactants. Calculate rate constants. (15) How did you calculate for these? Show the plots that you used to determine these. Did you need to reject some data points? Why? Show residual plots. Error calculations. (9) Correlation coefficients. (4) Discussion (60) Using the result of your error analysis, comment on how your calculated rate constant agreed with the accepted values. (5) Did you make any assumptions about the role of any of the reactants in calculating for the rate constant? What is the order of the reaction for all of the reactants? (5) What are your observations on the linearities of your data as you change the concentration of reactants? (20) Does the linearity assumption vary with reactant concentration? Any explanations for these observations? How do these observations impact your results? What exactly does an R2 value tell you in terms of probabilities of your data actually following the best-fit line? How do the slopes for each [Br] vs t curve behave? (10)
Is there a particular concentration range where the slopes are farther away from the average?
What measurement(s) contributed the most to the calculated errors? (5) What could be done to reduce the error from the largest source? (5) What are possible sources of errors for this experiment? (10) How will these errors affect your results? Will they increase or decrease the rate constant? Conclusion (5) Formatting, Grammar, Style (5) Note on grading: This grading checklist should serve as a guideline as to the minimum requirements for the lab report. Don’t limit yourselves to merely answering the questions (though they should be answered).
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