CHEM 212 GMU Measurement of an Equilibrium Constant Handout Lab Report
I’m studying for my Chemistry class and need an explanation.
1. Fill in the Data table
Table 1. Raw data for the calibration curve portion of the measurement of an equilibrium constant experiment
Solution # |
Concentration (M) |
Absorbance |
1 |
0.00E+00 |
0 |
2 |
6.18E-05 |
0.154 |
3 |
1.03E-04 |
0.22 |
4 |
1.44E-04 |
0.352 |
5 |
2.06E-04 |
0.514 |
Table 2. Raw and processed Data for the determination of the equilibrium constant portion of the measurement of an equilibrium constant experiment
Concentration of Fe3+ (M) |
|
||
Concentration of SCN- (M) |
|
||
|
Test Solution
|
Test solution |
Test solution |
Initial Volume SCN- (mL) |
|
|
|
Initial Concentration SCN- (M) |
|
|
|
Initial Volume Fe3+ (mL) |
|
|
|
Initial concentration Fe3+ (M) |
|
|
|
Absorbance |
|
|
|
Equilibrium concentration Fe(SCN)2+ (M) |
|
|
|
Reacted Concentration of Fe3+ (M) |
|
|
|
Reacted Concentration of SCN- (M) |
|
|
|
Equilibrium Concentration of Fe3+ (M)
|
|
|
|
Equilibrium Concentration of SCN- (M) |
|
|
|
Equilibrium Constant |
|
|
|
Average Equilibrium Constant |
|
|
|
Standard Deviation of Equilibrium Constant |
|
|
|
2. Complete the results section that in found in the lab manual attached below pages 205-206. The experiment is pages 195-206. The raw data in excel is also attached below. Please include a picture of any graphs as well as on excel because my excel is old.
3. include 1-5 sentences that briefly summarize the procedure
and what information was obtained
■ Example:
– ____ g (or mL) of Reagent A were reacted with _____ g (or mL) of
Reagent B until a precipitate formed/gas evolved/color change
occurred. Observations were made and data were collected. Table 1
represents _____. Table 2 represents _____. Figure 1 represents
_____. Figure 2 represents ____.
4. Complete the Discussion: In your discussion section address the following questions:
How does your equilibrium compare with the rest of the class?
Is there much class variation in the results?
What does the calculated equilibrium constant tell you about the equilibrium position of the
reaction you studied? Does the reaction favor reactants or products?
Compared with the class is your mean and standard deviation similar? Why or why not?
5. Also include a conclusion, Example:
■ Restate the purpose of the experiment
■ How did you attempt to meet the purpose?
■ Was the purpose met?
■ Restate the anticipated outcome. Was the actual outcome close to
the anticipated outcome?
■ Why or why not? What errors did you specifically experience in
this experiment?
– Distance-learning format of the class is not an error
■ What are some future improvements to this experiment?
– “Updating the lab manual”, “clear/better instructions on
how to perform calculations”, “instructor not explaining the
lab procedure”, “do not make the class a distance-learning
course”, etc. are NOT future improvements
Please let me know if you have any questions!