McMullen_exp13_graded-1

McMullen_exp13_graded-1 - Experiment 13 Chemical Kinetics...

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Unformatted text preview: Experiment 13 Chemical Kinetics Spring 2010 Name Chelsea McMullen Lab Section 428 Point Summary (See Blackboard for detailed grading rubric) Superior Excellent Satisfactory Fair Poor Omitted Introduction Purpose of Report 3 Goals of Experiment 4 Materials and Methods 4 Results and Discussion Description of data 2.5 Data Tables 3 Data Table Titles 4 Graphs 7 Figure Captions 4 Sample Calculations 9 Systematic Error 6 Random Error 6 Discussion of discrepancies 6 Other 1.5 Lab Technique 20 TOTAL POINTS 80 TA Comments/Suggestions: Numbers are a little off, but calculations are done correctly. Error discussion needs be a little more in depth. C HEMISTRY 102L R EPORT T EMPLATE EXPT. Chemical Kinetics: Reaction of Crystal Violet with Sodium Hydroxide 13 13 Introduction The purpose of this report is to use the data gathered about the rates of the reactions to determine the specific rate constant of each solution of crystal violet and NaOH. The objective of the experiment was to determine the reaction rate of a standard solution as well as three diluted solution using a colorimeter to determine absorbance of each of the solutions, and determine the concentration of each solution using Beers law, in order to find the specific rate constant by both the initial rate method and the integrated law method, and compare the values of each method. Materials and Methods The procedure for this experiment was taken from UNC Chemistry 102L Lab Manual, Experiment 13: Chemical Kinetics: Reaction of Crystal Violet with NaOH. There were no deviations from the procedure. Results and Discussion The colorimeter is used to determine the rates of the chemical reactions by measuring the absorbance of each solution. The colorimeter was then used to measure the concentration of each solution during a reaction, using the equation if the linear regression on the absorbance vs. concentration graph to measure the concentration, and the concentration vs. time graph was used to determine the rates of the chemical reactions. The reaction that was taking place was between 9-mL of Crystal Violet and 1-mL of aqueous NaOH. In this reaction, the dark purple color of the Crystal Violet becomes lighter until all the Crystal Violet is consumed and it become colorless. The colorimeter can measure this because as the dark purple color decreased in intensity, the absorbance values will increase as the concentration values decrease....
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This note was uploaded on 04/20/2010 for the course CHEM 102L taught by Professor N/a during the Fall '07 term at UNC.

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McMullen_exp13_graded-1 - Experiment 13 Chemical Kinetics...

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