Experiment 13 Chemical Kinetics

Experiment 13 Chemical Kinetics - Experiment 13 Chemical...

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Experiment 13 – Chemical Kinetics Summer 2010 Name TD Khang Lab Section 409 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 purpose of this experiment is to use plots and initial rates to determine the rate order and rate constant (k) for a reaction of crystal violet with sodium hydroxide. Also, this experiment is used to compare two different ways to determine reaction rates, graphical method using integrated rate laws and initial rates method. The goal of the experiment was to use the 0, 1 st , and 2 nd integrated rate laws to determine the rate order of the reaction. If the reaction was zero order than the plot of concentration vs. time would have produced a line, if the reaction was 1st order than the plot of natural log of concentration vs. time would have produced a line, and if the reaction was 2nd order than the plot of inverse concentration vs. time would have produced a line. Another goal was to use the initial rates and concentrations to determine rate order. Initial concentrations of Crystal violet were determined and mixed with corresponding amounts of NaOH causing dilution to occur. Plots of the concentration of CV as time progressed created curves in which initial rates could be determined through linear fits. Materials and Methods The procedure for this experiment was taken from the experiment 13 lab manual in the CHEM 102 lab folder at the University of North Carolina at Chapel Hill in the fall semester of 2010. Some deviations from the given procedure had occurred due to environmental factors and the manual actions of the experimenters. Deviations from the procedure did occur. Experimenters stopped the recordings of the concentration vs. time plots if a stabilizing point was reached before the exact time of recording. Results and Discussion Colorimetry is where the concentration of a chemical in a solution can be determined, if it has a color, by measuring the intensity of the color and relate the intensity of the color to the concentration of the solution. Crystal violet has a purple color thus it can be used with a colorimeter. The reaction between Crystal violet and Sodium hydroxide NaOH is observed. As time progresses, the concentration of CV will decrease thus causing the color to become diluted. The colorimeter will record the color change and the concentrations can be determined based on the color dilution. Beer's Law is a way of
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Experiment 13 Chemical Kinetics - Experiment 13 Chemical...

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