Harvard University Equilibrium Lab Report

EQUILIBRIUM CONSTANT DETERMINATION LAB REPORT componentsParagraph 1: Theory & Reaction studied
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The concept under investigation is equilibrium; relate this to the guiding question.
What is a formation constant?
Discuss ICE charts.
What technique will allow the formation constant to be determined? (Hint: product
has a color.)
What is the reaction system being studied?
Discuss the relationship of the size of the equilibrium constant and Le Châtelier’s
Principle with regard to direction the reaction proceeds.
Paragraph 2: How did you go about your work and why did you conduct your investigation
in this way?
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Discuss using colorimetry, and what wavelength was used and why it was selected.
Discuss using the dilution formula and why it is necessary.
For Part 1, include Beer’s Law plot information; that is, how was data for plot
obtained. Include the correlation coefficient.
For Part 2, mention making different solutions and measuring the absorbance
recorded.
Paragraph 3: What is your argument?
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Report final Kf ± SD.
Discuss the meaning of the Kf value in terms of favoring reactants or products.
Justify any data discarded using 4D test.
Comment on size of SD regarding data distribution.
Discuss why Kf values may differ.
Discuss size of correlation coefficient for Beer’s Law and what this means about
your data.
• Compare your Kf to values of scientific community
• Include the data table for all 5 trials. You do not need to include the data table for
Beer’s Law determination.
• Include sample calculations for
✓ the initial diluted concentrations of Fe3+ and SCN–;
✓ the determination of equilibrium FeSCN2+concentration from absorbance using
Beer’s Law linear regression equation;
✓ one complete ICE chart calculation of equilibrium concentrations of Fe3+ and SCN–
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✓ the related Kf calculation.