Lab 3 - Iron Analysis By: Cassandra Shenefelt TA: Hillary...

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Iron Analysis By: Cassandra Shenefelt TA: Hillary Easter Designator: Dr. MacCarthy Thursday 2:00 PM to 4:50 PM March 20, 2008 Abstract The goal of this experiment is to find the amount of iron in a given sample. Mixing the iron in a specific combination of hydroxylamine hydrochloride, 1,10- phenanthroline and hydrochloric acid did dissolve the iron. Once the iron was dissolved small samples from the flask were run through a spectrophotometer to check the clarity of the samples. The clearer the samples the less dissolved the iron was in the solution.
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Background When iron is combined with phenanthroline it forms a complex that is very stable. To determine the amount of iron in the solution a spectrophotometer is used. The spectrophotometer determines the absorbency of light in the solution. The higher the percentage the more dissolved the iron is. Spectrophotometers are used in many ways. One way is forensics; forensic scientists will find a pure substance and place it through a spectrophotometer, which will allow the scientist to identify the unknown. However, since it is difficult to find a substance in pure form this process is being phased out but not completely. Introduction This lab will show how to determine the amount of a dissolved solid is in solution by its light transmittance, absorbency, and an assisted calibration curve. The solid is ferrous iron which is a heavy metal and takes time and highly concentrated acid to dissolve. The iron is mixed with a phenotrophaline compound and combined they absorb visible light strongly; this combination will make it possible to determine the weight percentage from the transmittance. The amount of dissolved iron is graphed onto a calibration curve; the curve is very significant in finding the amount of an unknown mass of iron. Materials 1. 2 200mL Volumetric Flasks 2. 3 250mL Beakers 3. 1 50mL Graduated Cylinder 4. 2 10mL Graduated Cylinders 5. Spectronic 20’s
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Methods This experiment had two parts, the first part was using a known amount of iron already in solution to determine the concentration, and the second part was using an unknown solution and then determining the weight percent from the absorbency and concentration of the iron. The first part of experiment required the instructions to be followed exactly. The first step was to obtain 25mL of hydroxylamine hydrochloride into a clean 250mL beaker, next was to obtain 25mL of 1,10-phenanthroline in a second cleaned beaker and thirdly obtain 150mL of 6M HCl into a third clean beaker. Properly label these beakers as these must go into the mixture in a particular order. From the iron solution (0.0625g/l) obtain 40mL of it into a 50mL volumetric flask. Transfer the iron into a clean and dry volumetric flask. Next, place the standard iron solution in a clean 50mL buret, and deliver about
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Lab 3 - Iron Analysis By: Cassandra Shenefelt TA: Hillary...

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