Laboratory Course V: Physical Chemistry Practical

A list of experiments under different heading is given below. Students are required to perform atleast 8-10 experiments.

Thermochemistry

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

ii. Determine the partial molar volume of methanol/ethanol-water system at normal temperature and pressure.

Chemical kinetics

i. Determine the rate constant, energy of activation and entropy of activation in the oxidation of benzyl alcohol (C₆H₅CH₂OH) by potassium permanganate in acidic medium

ii. Determine the formation constant for the (Ce⁺⁴-H₃PO₂)intermediate complex and also its decomposition rate constant at the room temperature.

iii. Determine the rate constant for the bleaching of malachite green in basic medium at room temperature spectrophotometrically.

Electrochemistry

i. Determine equivalent conductance of the strong electrolytes (KCl, HNO₃, HCl etc.) at several concentrations and verify the Onsagar’s equation and also find the values of a and b in the equation.

ii. Determine the equivalent conductance of acetic acid at infinite dilution and calculate its degree of dissociation at different dilutions as well as dissociation constant at the room temperature.

Phase Equilibrium (any one)

i. Determine the solubility diagram for a three component liquid system chloroform, acetic acid an water or toluene, acetic acid in water or benzene ethanol and water. Discuss the diagram in a light of phase, component and degree of freedom.

ii. Nerst Distribution Law

To determine the formula of a complex formed between silver and ammonia.

Potentiometry

i. Determine the concentration of ferrous ion in the given solution by titrating against N/10 Cr₂O₇^-- or Ce⁺⁴ ion solution. Determine the equivalence point by plotting E v/s V, ∆E v/s ∆V and ∆²E/∆V² v/s ∆V.

Spectrophotometry

i. Determine the acid dissociation constant (pK value) of methyl red.

ii. Determine the stability constant of FeSCN⁺² complex ion keeping ionic strength constant.

iii. Determine the composition and stability constant of the complex Fe (III)/salicylic acid system by jobs variation method.

Polarography

Determine the half wave potentials of Cd⁺² and Zn⁺² ions 0.1 M KCl solution and show that half wave potential is independent of the concentration.