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Lab Report on Stoichiometry of a Metal Complex

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Discussion Questions

  1. What was the purpose of this experiment?
  2. What is the hypothetical equation for the reaction of Fe2+ and ortho-phenanthroline?
  3. When preparing the samples, the amount of stock B (Fe+2) was constant but the amount of
    ortho-phenanthroline increased.
Amount of
ortho-phenanthroline increased with the amount of stock B (Fe+2) remaining constant
  1. The “n” value is the mole ratio for the balanced equation. Mole ratios in a balanced equation
    are whole number values (i.e integers). Write the full balanced equation for the reaction
    between Fe+2 and ortho-phenanthroline using in your result for “n”.
  1. The true result for n = 3. Calculate the % error. Compare your experimental result to this value and comment on the comparison.

% error = [(𝑎𝑐𝑡𝑢𝑎𝑙 𝑣𝑎𝑙𝑢𝑒−𝑒𝑥𝑝𝑒𝑟𝑖𝑚𝑒𝑛𝑡𝑎𝑙 𝑣𝑎𝑙𝑢𝑒)/ 𝑎𝑐𝑡𝑢𝑎𝑙 𝑣𝑎𝑙𝑢𝑒] x 100

  1. Discuss 3 possible sources of experimental error and how the errors would affect the results.

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Final Calculations

You should complete and submit all of the following calculations.  Remember, a complete calculations section includes:

For this experiment, you can show your worked out calculations in the space provided or on a separate page.

This first set of calculations deals with the Fe+2 solutions used in the experiment.

Stock A Molarity:  (Note: 0.XXXX grams comes from the data pic for grams of ferrous Av

MA =

Stock B Molarity:  (note:  VA = 25.00 mL (volume of the pipet) and VB = 250.0 mL (volume of the volumetric flask)

MB =

Millimoles of Fe+2 in solutions # 1 – 8:  For each solution 10.00 mL of the Stock B solution was pipetted into each flask.

Millimoles of Fe+2  =  (10.00 mL) x (MB)

This set of calculations deals with the information from the graph.

Average Absorbance for the Horizontal Data:  Determine the average value for the absorbances of the 3 horizontal data points

Average Horizontal Absorbance =

Intersection point of the graph.  You should notice on the graph that if a horizontal line is drawn through the horizontal points, it will intersect the increasing trendline.  You can calculate the millimoles of ortho-phenanthroline that corresponds to that intersection point by using the y = m x + b trendline equation from the graph. 


You can solve for the “x” value – this is the millimoles of ortho-phenanthroline at the intersection

y = m x + b“n” value – this is the ratio of the millimoles of ortho-phenanthroline at the intersection point to the millimoles of Fe+2 in the solutions.

“n’” = Millimoles of ortho-phenanthroline at the the intersection point / millimoles of Fe+2 in each solution

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General Graph Format

HOW TO DRAW THE GRAPH IN EXCEL (2016) For The Stoichiometry Of A Metal Complex Experiment

Note:  This graph will have 2 sets of data plotted and one best fit line with the y = m x + b equation

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