Analysis of cereal

Analysis of cereal - Alec Hildreth Bryan Ringstrand 2.4.38...

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Alec Hildreth 2.4.38 Bryan Ringstrand 5:00 Mon Analysis of Cereal Introduction The purpose of this experiment is to analyze the iron content of questionably labeled cereal and iron tablets. This is done using spectrophotometer compound analysis of solutions made from preparations of the cereal and iron tablets in question. These results are compared graphically to the graph of the spectrophotometer analysis of samples of increasing concentration of Fe(NO 3 ) 3 . The RDA of iron is 18 mg or .018 g. Experimental First, a calibration curve was created by measuring the absorption of KCSN Fe(NO 3 ) 3 solutions of increasing concentrations of Fe(NO 3 ) 3 on a spectrophotometer. The spectrophotometer was zeroed using the same solution of HNO 3 used to make the Fe(NO 3 ) 3 and the same cuvette used to measure all the samples of Fe(NO 3 ) 3 . This eliminates all background absorbency and accounts for the same minor impurities in the cuvettes eliminating error from that. The .00125 M Fe(NO 3 ) 3 was prepared using .0503 g Fe(NO 3 ) 3 placed into a 100 mL volumetric flask then filled to the line with 1.0 M HNO 3 . The .1 M KCSN solution was prepared the same way using a 100 mL volumetric flask, except .98 g of KCSN were used instead of Fe(NO 3 ) 3 . The starting solution was a mixture of 1 mL of 0.00125 M Fe(NO 3 ) 3 and 100 mL of .1 M KCSN. A sample was placed in the cuvette and measured on the spectrophotometer. The sample in the cuvette was then replaced into its original starting beaker where another 1 mL sample of 0.00125 M Fe(NO 3 ) 3 was added. This process was repeated 10 times until a total of 10 mL of 0.00125 M Fe(NO
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This note was uploaded on 04/02/2008 for the course CHEM 102a taught by Professor Hanusa during the Fall '06 term at Vanderbilt.

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Analysis of cereal - Alec Hildreth Bryan Ringstrand 2.4.38...

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