Chemistry lab reports
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Report4.docxCHM1046 Lab - REPORT # 4
Last name, First name: Student ID:
1) Date of the experiment:
2) Experiment #:
3) Experiment Title:
4) Purpose of the Experiment –
5) Background/Brief Introduction–
6) Experimental Procedure: (Passive Mode)
7) Data:
8) Experimental Results:
You must show all your calculations to receive credit for them!
Stock concentration of FeCl3 = 1.00 mL x 0.3 M in a 100.0 mL volumetric Flask
Concentration of FeCl3 in 100 mL volumetric flask = ? M
Stock concentration of KSCN = 1.00 mL x 0.1 M in a 100.0 mL volumetric Flask
Concentration of HSCN in 100 mL volumetric flask = ? M
|
Sol. No. |
Concentration of FeCl3 in each test tube |
Absorbance |
|
1 |
1 mL x ? M / 10mL = ???? |
0.090 |
|
2 |
2 mL x ? M / 10mL = ???? |
0.170 |
|
3 |
|
0.430 |
|
4 |
|
0.960 |
|
5 |
|
1.170 |
|
Calculation of "k" from the manual graph: |
Value of K:
|
DETERMINATION OF "Kc" UNKNOWN CONCENTRATIONS
|
Sol. No. |
Absorbance of Fe(SCN)2+ |
Concentration of Fe(SCN)2+ |
Kc* |
|
6 |
0.009 |
|
|
|
7 |
0.013 |
|
|
|
8 |
0.017 |
|
|
|
9 |
0.020 |
|
|
|
10 |
0.025 |
|
|
*Determine only after completing the table above.
|
Sol. No.
|
Initial Concentrations of Reactants |
Concentrations of Reactants at Equilibrium |
||
|
|
[Fe3+] |
[SCN-] |
[Fe3+] |
[SCN-] |
|
6 |
|
|
|
|
|
7 |
|
|
|
|
|
8 |
|
|
|
|
|
9 |
|
|
|
|
|
10 |
|
|
|
|
Average value of Kc:
LABORATORY REPORT
CONSIDERATIONS FOR DISCUSSION AND CONCLUSIONS SECTION
As you write your discussion and conclusions paragraphs in your lab notebook, here are some tips and questions you should be answering. (This is in addition to the "Guidelines for a good discussion and conclusion" handout provided to you at your first lab class.)
· Explain in your own words how you were able to determine the concentration of reactants at equilibrium? Hint: Discuss the ICE table and how it was used .
· In utilizing your data to explain this experiment, consider and discuss the process by which all data were collected (including graphs) .
· For the constant determined at the end, what does the value mean in regard to greater than or less than one, as explained in the text?
Note: As this is an equilibrium experiment, please make sure to explain all concepts in terms of equilibrium.
9) Results and Discussion:
10) Conclusions:
11) Question(s):
