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Determining An Equilibrium Constant Lab Report

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CHML 1046 General Chemistry 2 Laboratory Experiment Determining an Equilibrium Constant References: Experiments in General Chemistry by R.A.D.Wentworth, 8th Edition, 2005. Houghton Mifflin, New York, pp. 273-284. Objective: Experimentally determine the equilibrium constant for the formation of Fe(SCN)+2. Master dilution techniques and proper use of volumetric glassware. Practice calculation of concentrations and set up of ICE table. Use spectrophotometer to evaluate relationships of solution concentration and absorbance of light. Apply graphing techniques to represent experimental data. Evaluate results for the precision. Introduction: The reaction you will be performing is the synthesis of the complex ion Fe(SCN)+2. The color …show more content…

Provide chemical formula of the compound responsible for the red color of your experimental solutions: 5. How is Le-Chatelier’s principle used in this experiment? Measurements and Calculations Part I. Calculate concentration of Diluted solution of Fe(NO3)3 : Calculate concentration of Standard Solutions (show representative calculation): Table 3. Concentrations and Absorbances of Standard Solutions Test Tube # [FeSCN2+] A (Absorbance) Trial 1 A (Absorbance) Trial 2 1 2 3 4 5 Plot Absorbance vs [FeSCN2+] for Trial 1 and Trial 2 on graph paper or use a graphing program like Excel. Make sure to label axis, title the graph, and double check the coordinates of the data points. Attach your graphs to the Report. Calculate the slope of the calibration curve. Provide the value and units of the slope. How you will use the slope? Slope = (specify units!) Part II. Table 4. Measured Absorbances Test Tube # Absorbance Trial 1 Trial 2 6 7 8 9 10 11 12 13 14 15 Calculate Initial concentrations of Fe3+ and SCN- for each of the test solutions. Record the results in Table 5. Show representative

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