Physical Chemistry Lab II

Paper Code: 
CHY-227
Credits: 
3
Contact Hours: 
90.00
Max. Marks: 
100.00
Objective: 

 

Course Objectives :

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

Course Outcomes (COs):

COURSE

Learning outcomes (at course level)

Learning and teaching strategies

Assessment Strategies

Paper Code

Paper Title

CHY 227

Physical Chemistry Lab II                   

 The students will be able to-

 

CO81- apply the knowledge of lab safety measures during the experimental work.

CO82- prepare solution of desired concentration.

CO83- explain the principles behind the experiments performed in the lab and calculate these values (stability constant, pKa value, partial molar volume)

CO84- perform experiments based on pH-metry, potentiometry, thermochemistry, phase equilibria

 and spectrophotometry.

CO85- perform scientific experiments as well as accurately record experimental data with proper significant figure and analyze the results of such experiments.

Demonstration

 

Discussion

 

Group Activity

 

Practical performance

 

Written test

 

Google quiz

 

Viva-voce

Semester end examination (Practical as well as written test followed by Viva-voce)
 

 

Unit I: 

CONTENTS

A list of experiments under different headings is given below. Students are required to perform 10-12 experiments (minimum two from each category).

Thermochemistry

i. 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.

ii. 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.

iii. To determine the partial molal volume of solute (KCl or NaCl) and solvent in a binary mixture at normal temperature and pressure.

iv. To determine the partial molar volume of methanol/ethanol-water system at normal temperature and pressure.

Phase Equilibrium

i  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.

ii  Nernst Distribution Law: To determine the formula of a complex ion formed between cupric ion and ammonia by distribution method.

iii  To study the freezing point curve of two component simple eutectic system (acetamide-benzoic acid/naphthalene-benzoic acid)

Polarimeter

i. 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.

pH Metry

i. To titrate the given mixture of CO3-2 and HCO3- ions against a strong acid, 0.1N HCl solution and to determine their strength.

ii. To determine pKa values of tribasic acid (H3PO4) against a strong base (NaOH).

iii. To determine the acidic and basic dissociation constant of an amino acid and hence its isoelectric point.

iv. To determine of pKa values of maleic/malonic acid by potentiometric titration with NaOH using glass electrode.

Spectrophotometry

i. To determine the acid dissociation constant (pKa value) of methyl red.

ii. 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.

References: 
  • 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. M. Rattenbury, Pergamon Press, 1966.
  • Advanced Practical Physical Chemistry; Thirtieth Edition; J. B. Yadav; Krishna Prakashan Media Pvt. Ltd., Meerut, 2011.
  • Experimental Physical Chemistry; First Edition; V. D. Athawale, P. Mathur; New age International (P) Ltd. Publishers, New Delhi, 2011.

 

Academic Year: 
2021-2022
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