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Lab Report Spectrophotometric Determination of Iron
Atmospheric Chemistry (Chem 4800)
Carleton University
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Title: Spectrophotometric Determination of Iron
Calculations:
RESULTS:
Record the unknown sample number and the actual concentration of iron in mg/mL. a. Sample #1, Unknown 1 y=mx+b Absorption=(slope)(concentration)+b concentration=(absorption-b)/slope concentration=(0+0)/4. concentration= 0. concentration=0 mg/ml b. Sample #1, Unknown 2 y=mx+b Absorption=(slope)(concentration)+b concentration=(absorption-b)/slope concentration=(0+0)/4. concentration= 0. concentration=0 mg/ml
Prepare a table of Concentration vs. Absorbance values for each solution of iron. a. Concentration (mg/50mL) Absorbance Reading
0 0
0 0.
0 0.
0 0.
0 0.
0 1.
(Unknown trial 1) 0 0.
(Unknown trial 1) 0 0.
Discussion:
Prepare a plot of Absorbance vs. Concentration of the standard iron solutions (known concentrations). Express the concentration in the units of mg/50mL. Draw a line of best fit through the points of the plot to define the Beer-Lambert Law plot.
Use the equation of the line of best fit to determine the concentration of each unknown measurement. Place the unknown samples onto the plot using the known absorbance and the calculated concentration values. a. Sample #1, Unknown 1 y=mx+b Absorption=(slope)(concentration)+b concentration=(absorption-b)/slope concentration=(0+0)/4. concentration=0 mg/ml b. Sample #1, Unknown 2 y=mx+b Absorption=(slope)(concentration)+b concentration=(absorption-b)/slope concentration=(0+0)/4. concentration=0 mg/ml
My results for the unknown sample was 3% lower than the actual value of 0 g/L. The reason for this could be due to several things. One being pipetting more than 10 of the unknown sample into the 250 ml volumetric flask. The second reason being not reaching the exact mark for diluting the volumetric flask with distilled water. The third reason being the ±0. mL typical uncertainty for the 10 pipette and the ±0 mL uncertainty for the 250 mL volumetric flask.
Conclusion:
In conclusion the the average value of the unknown sample #1 of iron was 0 mg/ml. The relative error and the relative spread were 3% and 4 respectively.
Lab Report Spectrophotometric Determination of Iron
Course: Atmospheric Chemistry (Chem 4800)
University: Carleton University
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