exp14_template

exp14_template - Experiment 14 – Determination of an...

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Unformatted text preview: Experiment 14 – Determination of an Equilibrium Constant Summer 2010 Name Type name Lab Section Type Section Number 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:       CHEMISTRY 102L REPORT TEMPLATE Determination of an Equilibrium Constant EXPT. 14 Introduction Using the grading rubric as a guide, write a clear and concise paragraph that states the purpose of the report and the goals of the experiment. Try to explain what you were trying to do and why it is significant. Materials and Methods The procedure for this experiment was taken from reference the lab manual. Describe any deviations from the given procedure. This should be written in past tense using clear paragraph organization following the guidelines for writing experimental procedures. Results and Discussion Using the “Description of Data” section of the rubric as a guide briefly describe the raw data collected when preparing the stock solutions of iron (III) nitrate nonahydrate and sodium thiocyanate solutions. Refer reader to data presented in Table 1. Table 1. Insert title. Insert table of mass of iron (III) nitrate nonahydrate and sodium thiocyanate used to prepare stock solution as well as the concentration of each stock solution. Using the “Description of Data” section of the rubric as a guide, briefly (1-2 sentences) introduce the concept of colorimetry and Beer’s law. Describe how serial dilutions were used to prepare the standards for the calibration curve and show a sample calculation as described in the grading rubric for any relevant calculations related to the preparation of the standards. Refer reader to the summary of all calculated results in Table 2 and Beer’s law plot presented in Figure 1 and Beer’s law regression data in Table 3. Table 2. Insert title. Insert a table that includes the following data for each of the 5 standards prepared for the Beer’s law plot: Volume of NaSCN stock solution, Total volume of diluted solution, Concentration of FeSCN 2+ and Absorbance. Insert Beer's Law plot of Absorbance versus Concentration Figure 1. Insert caption that describes the graph. Table 3. Insert title. Insert a table that includes linear regression data from the Beer’s law plot. Using the “Description of Data” section in the rubric as a guide, describe the raw data collected for the preparation of the equilibrium solutions. Summarize the data in Table 4. Table 4. Insert title. Insert a table that includes the following data for each of the 5 equilibrium solutions prepared to determine the equilibrium constant: Volume of Fe(NO3)3 stock solution, Volume of NaSCN stock solution, Volume of HNO3, and Absorbance. Using the “Description of Data” section of the rubric as a guide, briefly describe the calculations performed to determine the equilibrium constant for this reaction. Summarize all calculated in Table 5. Following the calculation guidelines presented in the grading rubric, show a sample calculation for determining the initial concentration of Fe3+. Following the calculation guidelines presented in the grading rubric, show a sample calculation for determining the initial concentration of SCN-. Following the calculation guidelines presented in the grading rubric, show how the Beer’s law graph is used to determine the equilibrium concentration of FeSCN2+ Following the calculation guidelines presented in the grading rubric, use an ICE table to show a sample calculation for the equilibrium concentrations of Fe3+ and SCN- Following the calculation guidelines presented in the grading rubric, show a sample calculation for the determination of the equilibrium constant. Table 4. Insert title. Insert a table that includes the summary of the calculations shown above for each of the five equilibrium solutions. Describe sources of systematic and random error associated with the determination of the equilibrium constant. Be quantitative whenever possible. Use the “Systematic Error”, “Random Error” and “Discussion of Discrepancies” sections of the rubric to guide your writing of this section of the report. ...
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