Experiment 7 Determine of K for FeSCN(aq) 1. Objective: To determine the equilibrium constant for the formation of a com

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Experiment 7 Determine Of K For Fescn Aq 1 Objective To Determine The Equilibrium Constant For The Formation Of A Com 1 (46.12 KiB) Viewed 88 times

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Experiment 7 Determine of K for FeSCN(aq) 1. Objective: To determine the equilibrium constant for the formation of a complexion, FeSCN. Fe" (aq) + SCN (aq) → FeSCN?" (aq) [FeSCN2] Ky [Fe3+][SCN) II. Observations: Part A. Constructing a Beer's Law Plot Five solutions are prepared according to the table below. We assume in this first part, that the SCN determines the concentration of FeSON formed (because Feis in excess and SCN is limiting). So we can calculate the FeSCNconcentration just by using the moles of SCN that we started with. 0.200 M Fe(NO), (ml) 5.0 Data Table 1. Beaker Number 1 2 3 4 5 (Blank ) 5.0 5.0 5.0 Data not needed 0.0020 M KSCN (ml) 5.0 4.0 3.0 2.0 Data not needed olololo HO (mL) 40.0 41.0 42.0 43.0 Data not needed The samples are run on a visible spectrometer and an example of the data is shown below. Visible Spectra for 4 FeSCN24 solutions 1 | Fee 04 03 5000 N

Using the given data file in this experiment, construct your own plot of Absorbance versus wavelength with all 4 spectra on the same plot. Use the example of data above as a guide. Your plot should look similar, but not exactly the same. (Spectra Plot, 1 pt) • Be sure to include a chart title and axis titles (with units if applicable) • Include a chart title and include a legend that labels each spectrum with a different color and the concentration of the solution • Restrict the x axis to be between 400-600 nm • Select the wavelength that has the highest Absorbance (A) [highest point on the peak]. This is the An... Mark this point on your plot with a label. Insert an image of your spectra graph below: 3 3

Fill out the table below and determine the concentration of FeSCN? in each sample. Remember for Part A the limiting reactant is SCN (Calculations 2 pts) Table 1: Concentration of Solutions and Absorbance Values Show calculations Moles of Moles of Concentration of on the next page Beaker SCN FeSCN FeSON (M) 1 2 3 4 Insert your sample calculation here:

Using the (FeSON?", concentrations from above and the Absorbance values from the plot generate a Beer's Law plot (which is Absorbance vs. Concentration of FeSCN). You will need the equation of the line from the Beer's Law plot for Parts B and (Beer's Law Plot 1 pt) • See an example of a Beer's law plot in the Introduction to this experiment in your lab manual • Be sure that your axes are labeled properly, and your plot includes a title • You must include and display a trendline on your plot. To do this using Excel, start by right clicking on a data point. A list should pop up, click on "Add Trendline". Under Trendline Options, select Linear. At the bottom of the Options be sure to check the boxes for both "Display Equation in Chart and "Display R-squared value on Chart Insert an image of your Beer's Law Plot below: 5