calorimetric determination of iron lab

calorimetric determination of iron lab - Kris Kelly...

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Kris Kelly Calorimetric Determination Lab CHEM 122L 4/7/08 Introduction/Thesis: In this experiment, the concentration of iron will be determined through spectrophotometric analysis. A calibration curve can be created through the calculation of absorbance of each of the five standardized solutions and the three prepared solutions. The concentration of iron may then be determined from the calibration curve. Key Data: % Transmittance Absorbance Concentration (mg/ml) Standard 1 38.0 .42 .001 Standard 2 25.0 .60 .002 Standard 3 18.8 .726 .003 Standard 4 10.9 .963 .004 Standard 5 6.9 1.16 .005 Prepared soln 1 18.5 .733 .0026 Prep soln 2 22.0 .658 .0023 Prep soln 3 17.0 .778 .0027 Sample Calculations: Concentration of Standard 1 1 ml std soln 1 x (.050 mg Fe / 50 ml) = .001 mg/ml Fe Avg value for slope of calibration curve A/[soln] = slope .42/.001 = 420 mg/ml .60/.002 = 300 mg/ml .726/.003 = 242 mg/ml .963/.004 = 240.75 mg/ml 1.16/.005 = 232 mg/ml Avg = 286.95 mg/ml
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calorimetric determination of iron lab - Kris Kelly...

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