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CHEMISTRY LABORATORY XV
Course Objective(s):
This course will enable the students to -
- understand about the different concepts behind the gravimetric and volumetric techniques and its uses in separation of different metal ions from a given mixture.
- develop experimental skills through spectrophotometer for measuring composition of complexes.
Course Outcomes (COs):
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Course Outcomes |
Teaching Learning Strategies |
Assessment Strategies |
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On completion of this course, the students will be able to – CO147: apply the knowledge of volumetric and gravimetric techniques in separation and estimation of the amount of different metal ions present in the mixture. CO148: determine stability constant, formation constant and composition of complexes spectrophotometrically. |
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Gravimetric and Volumetric Analysis
Quantitative Analysis
- Separation and determination of two metals Ni-Zn, Cu-Fe and Cu-Ba involving volumetric and gravimetric methods.
- Separation and determination of three component mixture (one volumetrically and two gravimetrically, any two)
- Pb+2, Zn+2, Cu+2
- Zn+2, Cu+2,Fe+2
- Cu+2 Fe+2, Ni+2
- Cu+2, Ni+2, Mg+2
Spectrophotometry
- Determination of composition of iron-phenanthroline complex by
- Mole ratio method
- Job’s method of continuous variation
- To determine the stability constant of FeSCN+2 complex/ Fe(III)-salicylic acid/iron-phenanthroline complex/ zirconium alizarin red-S complex spectrophotometrically.
- Vogel's Qualitative Inorganic Analysis, Seventh Edition; G. Svelha, B. Sivasankar; Pearson Education India, New Delhi, 2012
- Vogel’s Textbook of Quantitative Chemical Analysis, Sixth Edition; M. Thomas, B. Sivasankar, J. Mendham, R.C. Denney, J. D. Barnes; Pearson Education, New Delhi, 2009.
SUGGESTED READINGS:
- Advanced Practical Chemistry, First Edition; S. C. Das; Calcutta Publishing, Calcutta, 2000.
e-RESOURCES:
- https://egyankosh.ac.in/bitstream/123456789/15906/1/Experiment-17.pdf (Gravimetric and Volumetric Analysis)
- http://www.pca.ac.in/uploaded_files/M.Sc%20CH-I-1%20Practical%20Manual.pdf (Gravimetric and Volumetric Analysis)
- https://www.yumpu.com/en/document/read/26115475/experiment-2-determination-of-the-composition-of-iron- (Job’s Method)
- https://pdfcoffee.com/report-inorgchem-determination-of-mole-ratio-of-iron-pdf-free.html (Mole ratio method)
- https://www.youtube.com/watch?v=tbV6QZPG2dg (stability constant)
- https://chem.libretexts.org/Courses/University_of_Arkansas_Little_Rock/General_Chemistry_Lab_(Fall_2021)/08%3A_Formation_Constants/8.2%3A_Lab_-_Formation_Constants_and_Complex_Ions (stability constant)
Scheme of Examination
The duration of examination will be 5 hrs.
The following exercises will be set in the examination
Quantitative Analysis 30 marks
Spectrophotometry 25 marks
Viva 15 marks
Total 70 marks
Quantitative Analysis
This exercise is separation and determination of two metals which involves volumetric and gravimetric methods. It carries 30 marks out of which gravimetric estimation carries 15 marks whereas 15 marks are for volumetric estimation.
The distribution of marks in both cases are given as under:
Gravimetric Estimation
|
% Error |
1.0 |
1.1 |
1.2 |
1.3 |
1.4 |
1.5 |
1.6 |
>1.7
|
|---|---|---|---|---|---|---|---|---|
|
Marks awarded |
15 |
13 |
11 |
9 |
7 |
5 |
3 |
0 |
Volumetric Estimation
|
% Error |
1.5 |
1.6 |
1.7 |
1.8 |
1.9 |
2.0 |
2.1 |
2.2
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2.3 |
|---|---|---|---|---|---|---|---|---|---|
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Marks awarded |
18 |
16 |
14 |
12 |
10 |
8 |
6 |
4 |
2 |
Spectrophotometry
The exercise carries 25 marks, five marks shall be awarded for preparatory work, setting up of an apparatus, neat and methodical work.
20 marks will be awarded for correct observation, use of correct formula, calculation and result within permissible limits.
Theory and procedure 6 marks
Correct observation and proper recording 7 marks
Use of correct formula and calculation 7 marks
Result 5 marks
The permissible limit will be decided by the examiner as it varies with the nature of experiment.
Viva
Oral questions shall generally be asked over the work assigned to the candidate. The purpose is to find out as to what extent the candidate has understanding the basic principles.
