PHYSICAL CHEMISTRY LAB II

Paper Code: 
CHY 328
Credits: 
3
Contact Hours: 
90.00
Max. Marks: 
100.00
Objective: 

Course Objectives :

The course aims to develop advanced hands on experience in the operation of conductivity meter, dropping mercury electrode and potentiometer. Acquire the knowledge of basic terminology regarding conductance, chemical kinetics, adsorption, polarography and potentiometry.

 

Course Outcomes (COs):

Course Outcomes

Learning Teaching Strategies

Assessment Strategies

  
 

 On completion of this course, the students will be able to-

CO124-predict the kinetics of different reactions.

CO125-verify the Onsagar equation experimentally and apply it for determination of equivalent conductance of weak and strong electrolytes.

CO126-perform experiment based on surface tension and viscosity measurements.

CO127-use polarography instrument and measure concentration of metal ion.

CO128-understand the principle behind the experiments performed in the lab.

CO129-perform scientific experiments as well as accurately record experimental data and analyze the results of such experiments.

CO130-perform experiments based on potentiometry and adsorption
  • Interactive Lectures
  • Discussions
  • Demonstrations
  • Technology enabled learning
  • Peer learning

 

 
  • Written test
  • Viva Voce

 

 

  
 

 

Unit I: 

A list of experiments under different headings is given below. Students are required to perform at least 8-10 experiments.

 

Chemical Kinetics

  

  1. To determine the effect of (a) change of temperature (b) change of concentration of reactants and (c) catalysts on the velocity constant of hydrolysis of an ester.
  2. To study the kinetics of the reaction between K2S2O8 (potassium persulphate) and KI (potassium iodide) and to determine the rate constant and the energy of activation of the reaction.
  3. To determine of primary salt effect in the kinetics of ionic reaction and to test the Bronsted relationship (Iodide ion is oxidized by persulphate ion).
  4. To study the kinetics of saponification of ethyl acetate by sodium hydroxide and to determine the rate constant.
  5. To determine the rate constant, energy of activation and entropy of activation in the oxidation of benzyl alcohol (C6H5CH2OH) by potassium permanganate in acidic medium.
  6. To determine the formation constant for the (Ce+4-H3PO2) intermediate complex and its decomposition rate constant at the room temperature.
  7. To determine the rate constant for the bleaching of malachite green in basic medium at room temperature spectrophotometrically.
  8. To determine the rate constant, order of reaction and energy of activation for saponification of ethyl acetate using NaOH conductometrically.

Electrochemistry

 

  1. To estimate the concentration of H2SO4, CH3COOH and CuSO4 by conductometric titration using NaOH solution.
  2. To determine equivalent conductance of the strong electrolytes (KCl, HNO3, HCl etc.) at several concentrations and to verify the Onsagar’s equation and find the values of a and b in the equation.
  3. To determine the equivalent conductance of acetic acid at infinite dilution and to calculate its degree of dissociation at different dilutions as well as dissociation constant at the room temperature.

  Potentiometry

  1. To determine the concentration of ferrous ion in the given solution by titrating against N/10 Cr2O7-- or Ce+4 ion solution and also determine the equivalence point by plotting E vs. V, ∆E vs. ∆V and ∆2E/∆V2 vs. ∆V.

Polarography (demonstration)

  1. To determine the half wave potentials of Cd+2 and Zn+2 ions in 0.1 M KCl solution and to show that half wave potential is independent of the concentration.

 

Adsorption

  1. To study the adsorption of acetic acid or oxalic acid from aqueous solution by activated charcoal or animal charcoal and to examine the validity of Freundlich and Langmuir adsorption isotherms.
  2. To compare cleansing power of samples of two detergents.
  3. To study the variation of surface tension of solution of n-propyl alcohol with concentration and to determine the limiting cross section area of alcohol molecule.
  4. To determine the radius of molecule by viscosity measurements (e.g. Glycerol)

 

Essential Readings: 
  • Practical Physical Chemistry; Thirtieth Edition; J. B. Yadav; Krishna Prakashan Media Pvt. Ltd., Meerut Advanced, 2011.

References: 

SUGGESTED READINGS:

  • Experimental Physical Chemistry, First Edition; V. D. Athawale, P. Mathur; New age International (P) Ltd. Publishers, New Delhi, 2011.
  • Experimental Physical Chemistry; R. C. Das and B. Behera; Tata Mc-Graw Hill publishing Co. Pvt. Ltd., 1993.
  • Experiments in Physical Chemistry, Fifth Edition, D. P. Shoemaker, C. W. Garland and J. W. Nibler,  Mc Graw-Hill, New York, 1998.
  • Introductory Practical Physical Chemistry; D. T. Burns  and E. Rattenbury, Pergamon Press, 1966.

e-RESOURCES:

 

MARKING INSTRUCTIONS

  1. The duration of the examination will be 6 hrs.
  2. The following exercises will be set in the examination
  1. Physical Chemistry Experiment                   55 marks
  2. Viva                                                              15 marks
    Total                                                             70 marks
  1. Physical Chemistry Experiment:

The exercise carries 55 marks. The candidates shall be given one exercise out of exercises prescribed in the syllabus. The exercises in physical chemistry can be modified by the examiner 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 one exercise out of the exercises prescribed in the syllabus.
The distribution of marks will be as follows

  1. Theory and procedure                                       10 marks
  2. Correct observation                                           15 marks
  3. Use of correct formula                                       8  marks
  4. Calculation                                                         15 marks
  5. Results                                                                7  marks

No marks for calculation will be awarded to a candidate for not calculating the result.
The permissible error will depend on the nature of the experiment. Generally, + 10% error may be taken as permissible error for experiments involving potentiometric and conductometric measurements. The constancy in values of rate constants may be taken into consideration while awarding marks in experiments on chemical kinetics. One mark shall be deducted for each + 2% error over permissible limit.

  1. Viva:

Oral questions shall generally be asked about the work assigned to the candidate. The purpose is to find out to what extent the candidate has an understanding of the basic principles of chemistry.

Academic Year: 
2022-2023
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