Physical Chemistry Lab I

Paper Code: 
24CHY127
Credits: 
3
Contact Hours: 
90.00
Max. Marks: 
100.00
Objective: 

This course will enable the students to-

develop experimental skills of various instruments (spectrophotometer, pH meter, polarimeter etc.) and gain knowledge of basic terms regarding phase equilibrium, thermochemistry, optical measurement and Lambert-Beer law.

 

Course Outcomes (COs):

Course

Learning outcome

(at course level)

Learning and Teaching Strategies

Assessment Strategies

Course Code

Course

Title

 

24CHY127

 

Physical Chemistry Lab I

 (Practical)

CO42:Calibrate and operate a variety of scientific instrument to perform observations related to the experiment.

CO43:Perform experiments based on pH-metry, thermochemistry and phase equilibria.

CO44:Perform experiments based on polarimetry, spectrophotometry and phase equilibrium.

CO45:Record experimental data accurately with proper significant figure and analyze the results of such experiments.

CO46:Compile and report the results efficiently and develop communication skills.

CO47:Contribute effectively in course-specific interaction.

Approach in teaching:

Laboratory instructions and

Demonstrations.

 

Learning activities for the students:

Peer learning, hands-on-learning,

interpretation of data, record writing and learning through virtual labs

 

Conduction of Experiments, Lab Records, Viva Voce, Quiz

 

Unit I: 

A list of experiments under different headings is given below. Students are required to perform 10-12 experiments.

 

Minor

  • To determine the solubility of benzoic acid at two temperatures in water-DMSO mixture (4:1) and to calculate the enthalpy change of the dissolution process.
  • To determine the lattice energy of calcium chloride from its heat of solution using Born-Haber cycle. Provided the enthalpy changes for Ca+2 (g) → Ca(g), 2Cl- (g) → 2Cl (g), Ca (g) → Ca (s), 2Cl (g) → Cl2 (g) and Ca (s) + 2Cl (g) → CaCl2 (s) are -451.1, 174.3, -38.8, -58.0 and -190.0 Kcal/mole respectively.
  • To determine the partial molal volume of solute (KCl or NaCl) and solvent in a binary mixture at normal temperature and pressure.
  • To determine the partial molar volume of methanol/ethanol-water system at normal temperature and pressure.
  • To determine the solubility diagram for a three-component liquid system chloroform, acetic acid and water / toluene, acetic acid and water / benzene ethanol and water. To discuss the diagram in a light of phase, component and degree of freedom.
  • To study the freezing point curve of two components simple eutectic system (acetamide-benzoic acid/naphthalene-benzoic acid).
  • To titrate the given mixture of CO3-2 and HCO3- ions against a given strong acid   and to determine their strength.
  • To determine pKa values of tribasic acid (H3PO4) against a strong base (NaOH).
  • To determine the acidic and basic dissociation constant of an amino acid and hence its isoelectric point.
  • To determine of pKa values of maleic/malonic acid by potentiometric titration with NaOH using glass electrode.

 

Major

  • Nernst Distribution Law: To determine the formula of a complex ion formed between cupric ion and ammonia by distribution method.
  • To determine the rate constant of the inversion of cane sugar in presence of hydrochloric acid and sulphuric acid by using polarimeter and evaluate the relative strength of the two acids.
  • To determine the acid dissociation constant (pKa value) of methyl red.
  • To determine the stability constant and composition of FeSCN+2 complex/ Fe(III)-salicylic acid/iron-phenanthroline complex/ zirconium alizarin red-S complex by jobs method of continuous variation and mole ratio method.

 

Scheme of Examination

 

The duration of examination will be 6 hrs.

The following exercise will be set in the examination

Physical Chemistry Experiment (two)                             

Experiment I                                                                                 35 marks

Experiment II                                                                                20 marks

Viva                                                                                             15 marks

Total                                                                                                  70 marks

 

The exercises in Physical chemistry can be modified by the examiners and the same will be explained to the candidates. However, such modifications will not involve any departure from the basic principles over which experiments are prescribed in the syllabus. Candidates shall be given 2 exercises out of the exercises prescribed in the syllabus. The distribution of marks will be as follows:

 

  1. Experiment I: Major experiment

The exercise carries 35 marks. One major experiment by lot will be given to perform. 5 marks shall be awarded for preparatory work, setting up of an apparatus, neat and methodical work. 30 marks will be awarded for correct observation, use of correct formula, calculation and result within permissible limits as follows:

  • Theory and procedure                                                               8 marks
  • Correct observation and proper recording                                 8 marks
  • Use of correct formula and calculation                                      8 marks
  • Result                                                                                        6 marks

 

  1. Experiment II: Minor experiment

The exercise carries 20 marks. One minor experiment by lot will be given to perform. 4 marks

shall be awarded for preparatory work, setting up of an apparatus, neat and methodical work.

16 marks will be awarded for correct observation, use of correct formula, calculation and result within

permissible limits as follows:

 

  • Theory and procedure                                                               4 marks
  • Correct observation and proper recording                                 5 marks
  • Use of correct formula and calculation                                      5 marks
  • Result                                                                                        2 marks

 

The permissible limit will be decided by the examiner as it varies with the nature of the experiment.

 

No marks for calculation will be awarded to a candidate for not calculating result.

 

  1. 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 of chemistry.

 

Essential Readings: 
  1. Advanced Practical Physical Chemistry, Thirtieth Edition; J. B. Yadav; Krishna Prakashan Media Pvt. Ltd., Meerut, 2015.
  2. Experimental Physical Chemistry, First Edition; V. D. Athawale and P. Mathur; New age International (P) Ltd. Publishers, New Delhi, 2011.

 

References: 
  1. Experiments in Physical Chemistry, Fifth Edition; D. P. Shoemaker, C. W. Garland and J. W. Nibler, Mc Graw-Hill, New York, 1998.
  2. Introductory Practical Physical Chemistry, D. T. Burns and E. M. Rattenbury, Pergamon Press, 1966.

 

e-Resources:

  1. http://vlabs.iitb.ac.in/vlabs-dev/labs/nitk_labs/Environmental_Engineering_1/experiments/determination-of-ph-nitk/simulation.html
  2. https://chemcollective.org/chem/fau/gc28n.html

 

Academic Year: 
2024-2025
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