Binary Liquid Vapour Phase Diagration Lab Report

Experiment 5: Binary Liquid-Vapour Phase Diagram
Student no.: 15226360 Date: 18-3-2016 Student name: Tong William Session: 3 Group: 7

Objective:

To determine the conductivity of sodium chloride with different concentrations.

To study the effect of concentration of acetic acid to the conductivity.

To understand Onsager’s Equation

Principle:

The heterogeneous equilibrium between two phases in a system of two components is concerned in this experiment. The acetone-chloroform at 1 atm pressure system is studied. A strong negative deviation from Raoult’s law is exhibited in this system in a maximum boiling point.

The two components of the solution are assumed to be ideal

14 vials were used for cotaining samples.

When the distillation was proceeding at a moderate speed at about the wanted temperature, the receiver was replaced with a vial as the condensed vapour sample (V) and the thermometer was read. Half of the vial was filled with the sample.

The stopper of the distillation flask was removed and using a dropper to collect the liquid. The sample was placed into appropriate vials as the liquid (L), and the vial was closed by the stopper.

For 59.0℃ (acetone-rich side of azeotrope). 25 mL of chloroform and 75 mL acetone were added into the 250 mL round bottom flask. Small amount of boiling stone was added into the flask. The mixture was then distilled. When the temperature was reached to about 59℃, half vial of distillate (1V) and 1 mL of the liquid residue (1L) were collected.

For 61.0℃, the distillation was then continued. Samples (2V, 2L) were taken at about 61.0℃.

For 63.0℃, the flask was cooled when the solution in the flask become almost empty. 25 mL of chloroform and 25 mL acetone were added to the flask and distillation was started again. Samples (3V, 3L) were collected at about