KAI LING CHEM111_Lab07-Fe_Vitamin_Report_form (1)

KAI LING CHEM111_Lab07-Fe_Vitamin_Report_form (1) - 2 value...

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Spectroscopic Determination of Iron - Lab Report Form EACH STUDENT WILL SUBMIT THEIR OWN LAB REPORT AND CALCULATIONS. BOTH OF THESE MUST BE COMPLETED BY THE INDIVIDUAL STUDENT. Name: Kai Ling Partner(s): Chris Kuhn / Matt Kapturowuski Raw data: Volume of 0.04 mg/mL Fe standard Fe concentration (mg Fe/mL) Fe concentration (mol Fe/L) Absorbance 10 mLs 0.004 7.15×10 -5 0.667 5 mLs 0.002 3.57×10 -5 0.344 2 mLs 0.0008 1.43×10 -5 0.138 1 mLs 0.0004 7.15×10 -6 0.060 Graph: Using Excel or a similar graphing program, cut-and-paste (Ctrl-C and Ctrl-V) a plot in the space below of the Fe concentration (in mol Fe/L) of the four standards on the x-axis and absorbance (no units) on the y-axis. When making the graph in Excel, you should select “scatter plot” instead of “line plot” otherwise the graph will be skewed. Apply a linear fit to the data and write down the equation of the line. Include the R
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Unformatted text preview: 2 value which is a measure of how well the data fits a straight line. (R 2 = 1 means a perfect fit). EACH INDIVIDUAL SHOULD MAKE THEIR OWN GRAPHS. Equation of linear fit: y=9378.3x + 0.0006 R 2 value: 0.9993 Fe tablet: Using the linear equation above, determine the mass of Fe in the tablet. Fe content of the tablet from the bottle (mg): 27 Fe tablet solution absorbance: 0.261 Fe tablet concentration from the equation (mol/L): 2.78×10-5 Calculated mass of Fe in the tablet (mg): 31.1 % error in Fe mass: 13.2% Compare the molar absorptivities (mol/L) (1 cm cuvette): from the linear fit equation =9378 from: 10 mL sample 9328.6 5 mL sample 9635.9 2 mL sample 9659.8 1 mL sample 8391.6 Average 9254.0 % error in average to the from the linear fit equation: 0.000141% ?...
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