Project #15511 - Chemistry Project

Hello,

I have a research project in Chemistry that I have to complete in 2 weeks and prepare a presentation for. The project involves using spectrophotometry to analyze a multivitamin for how much iron it has in each serving. According to the box, each tablet contains 18 mg of iron and so the lab work must replicate that. The actual experiment is described in the PDF article below. PLEASE ignore the standard addition instructions, just need to do the solutions for the typical Beers Law plot:


http://alpha.chem.umb.edu/chemistry/ch313/exp%209%20spectro%20fe.pdf

 

They also describe how to prepare the unknown as well. One change I was forced to make in order to get decent readings was to dilute all the solutions to 25 mL instead of 15 mL (I used graduated cylinders for this). I was able to produce one set of results (minus the unknown) and I need 3 more for my instructor to accept my work. Also, the CH3COONa, NH2OH.HCl, and Dipyridine solutions were not prepared by the instructor; I had to make them myself and thus had to calculate how much mass of each to dilute in a 100 mL flask. If you want those numbers, please ask me.


Basically I want someone to re-do the entire lab from scratch either entirely in theory (thus producing "mock" results that are reasonable) or within a laboratory setting and provide me with actual in-lab results for all solutions including the unknown batch that when applying Beers Law plot gives me the desired value of approximately 18 mg iron per tablet. The experiment itself is not particularly difficult to do as you will be able to tell when reading the instructions. The most important thing is it must make sense and describes all aspects of the experiment in full detail since I have a lot of trouble with chemistry.

If you choose to take the theory-only approach, please make sure the results are not too unrealistic. They should be plausible in their accuracy/precision. My 1st set of readings via spectrophotometry are as follows:

Blank     0

0          0.002 A

1          0.218 A

2          0.300 A

3          13.9 T

4          7.9 T

5          7.5 T

Unk       ???

Notice how the readings for the blank and test tubes 0, 1, and 2, are all in absorbance, and the rest are in transmittance. This is because we only have an old-fashioned spectrophotometer in our lab with a very weak measurement spectrum that could not give me readings for the more concentrated solutions in absorbance, so I had to measure them in transmittance instead. Please check to make sure these readings are accurate; in other words, these readings when applying Beers Law plot tell you exactly how much iron is in the standard solutions.

I am a college student who can only work part-time so I hope you take that into consideration when negotiating for a price. If you need anything else please let me know. Thanks!


Subject Science
Due By (Pacific Time) 11/04/2013 12:00 am
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