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Iron Content Analysis - HamorS

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					Iron Content Analysis                     Name                Sam Hamor              Formatted: Left: 1.25", Right: 1.25", Top:
                                                                                     0.75", Bottom: 0.75"
Lab Report Sheet
                                          Partner                    Mario Herra


                                          Section

Complete the data table below.

                                                   Concentration
                 Solution        Abs. Max.
                                                 (mg of Fe/100 mL)

                    1              .167               .0321

                    2              .417               .0802

                    3              .518               ,0996

                    4              .637                .123


In the space below write the equation of the trendline that you fitted to the
graph of your data and show one example of the calculations you performed to
determine the iron content of the standards. Please attach your graph to this
report.



Y=5.199x




The Beer-Lambert Law explains the relationship between the amount of light a
solution absorbs and the solution’s concentration. We express this as A = bc.
For your experimental data, what is the value of “b” (the extinction coefficient)?




Why did the “blank” solution need to have the sodium citrate, hydroquinone,
and o-phenanthroline added to them if there was no iron present to form a
complex?
Complete the table of results below for your vitamin tablets. Show an example of each
of the calculations used in the process of determining the iron content based on the
absorbance of the vitamin solution. Steps 4 – 7 of the Analysis Section in the lab
manual may be helpful in guiding you through the process.

                                Experimental        Advertised          Percent
 Solution      Abs. Max.
                                Iron Content       Iron Content        Difference
 Vitamin

Pre-natal




Calculation of percent difference between experimental result and advertised
value:




Suppose the experiment used another compound that had a higher “b” value.
How would the absorbance data be affected if you used solutions with the same
concentrations as this experiment? Would this change iron content of the
tablets?

				
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posted:1/28/2013
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