uncch102L_exp13

uncch102L_exp13 - Experiment 13 Chemical Kinetics Summer...

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Experiment 13 – Chemical Kinetics Summer 2010 I HAVE USED THIS LAB! IF YOU USE MY LAB VERBATUM, YOU WILL BE CAUGHT. Point Summary (See Blackboard for detailed grading rubric) Superior Excellent Satisfactory Fair Poor Omitted Introduction •Purpose of Report •Goals of Experiment Materials and Methods Results and Discussion •Description of data •Data Tables •Data Table Titles •Graphs •Figure Captions •Sample Calculations •Systematic Error •Random Error •Discussion of discrepancies Other Lab Technique TOTAL POINTS TA Comments/Suggestions:
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C HEMISTRY 102L R EPORT T EMPLATE EXPT. Chemical Kinetics: Reaction of Crystal Violet with Sodium Hydroxide 13 13 Introduction The goals of the experiment were to gain understating of chemical kinetics by relating the concentration of reactants to the reaction rates, and to determine, experimentally, the rate law and rate constant for a reaction of crystal violet with NaOH. The purpose of this report is to relay and analyze the data collected in the experiment, and to demonstrate understanding of reaction laws and rates. Materials and Methods The procedure for this experiment was taken from the Fall 2010 UNC-CH CHEM-102L Lab Manual, Experiment 13: Chemical Kinetics: Reaction of Crystal Violet with Sodium Hydroxide. The lab manual was followed precisely. Results and Discussion Colorimetry is a method to measure the amount of light that is absorbed by a solution. The amount of light absorbed is directly proportional to the concentration of the absorbing substance. In our experiment as the reaction precedes the NaOH decreases the absorbance by conjugating Crystal Violet, making the solution clear. We can use the change in absorbency over time to determine the reaction order and rate. Beer’s Law is a mathematical equation used to relate the absorbance of light to the concentration of molecules and is applied to the standard curve. The standard curve is a plot of absorbance verses concentration, with each point on the plot representing the absorbance of light in a solution of a known concentration. In Figure 1, the linear regression line represents Beer’s Law, and the data in Table 1 shows the closeness of the relationship between concentration and absorbency.
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Figure 1. The graph represents the standard curve acquired from four solutions of different concentrations. The linear regression line provides the relationship between absorbance and concentration, as defined by Beer’s Law. Table 1.
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This note was uploaded on 05/15/2011 for the course CHEM 102L taught by Professor N/a during the Fall '07 term at UNC.

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uncch102L_exp13 - Experiment 13 Chemical Kinetics Summer...

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