Physical Chemistry Lab II

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

Chemical Kinetics

i.   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.

ii.  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.

iii. 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).

iv. To study the kinetics of saponification of ethyl acetate by sodium hydroxide and to determine the rate constant.

v.  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.

vi. To determine the formation constant for the (Ce⁺⁴-H₃PO₂) intermediate complex and its decomposition rate constant at the room temperature.

vii. To determine the rate constant for the bleaching of malachite green in basic medium at room temperature spectrophotometrically.

viii. To determine the rate constant, order of reaction and energy of activation for saponification of ethyl acetate using NaOH conductometrically.

Electrochemistry

i.   To estimate the concentration of H₂SO₄, CH₃COOH and CuSO₄ by conductometric titration using NaOH solution.

ii.  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.

iii. 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

i.     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

i    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

i.     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.

ii.   To compare cleansing power of samples of two detergents.

iii. 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.

iv. To determine the radius of molecule by viscosity measurements (e.g. Glycerol)