Procedure

Materials Required

• Water bath
• Test tube
• Thermometer
• Stirrer

Reagents

Solvent:

• Water
• Benzene
• Carbon disulfide
• Carbon Tetrachloride
• Chloroform

Solute:

• Sodium chloride
• Calcium chloride
• Aluminium chloride
• Urea
• Glucose

Procedure

1. Take the test tube from the water bath.
2. Select a solvent component from the list.
3. Choose a known amount of solvent.
4. Place the thermometer into the test tube.
5. Place the test tube in the water bath.
6. Click the power on button.
7. Record the temperature of the solvent.
8. Click the power off button.
9. Take the test tube from the water bath.
10. Choose the solute from the list.
11. Choose its weight.
12. Place the test tube in the water bath.
13. Click power on button.
14. Record the temperature of the solution.
15. Use the boiling point of pure solvents to determine the elevation in boiling point.

Observations and Calculations

Solvent used = .....................................

Mass of the solvent = .................. g

Boiling point of the pure solvent = ............... °C

Solute used = ........................................

Mass of the solute = ................... g

Boiling point of the solution = ...................... °C

Therefore, Elevation in boiling point of the solution = ..................... °C

The van 't Hoff factor of the solute = .........................

The molar mass of the solute = ..............................

Results

Elevation in boiling point of the solution = ..................... °C

The van 't Hoff factor of the solute = .........................

The molar mass of the solute = ..............................

Points to Remember While Performing the Experiment in a Real Laboratory

• Always wear a lab coat and gloves when you are in the lab.
• When you enter the lab, switch on the exhaust fan and ensure all the chemicals and reagents required for the experiment are available.
• If reagents are not available, prepare them using the components for reagent preparation.
• Properly adjust the flame of the Bunsen burner. The correct flame is a small blue cone, not a large plume or an orange flame.
• Clean all working apparatus with chromic acid and distilled water. Ensure all apparatus are free from water droplets before beginning the experiment.
• Calibrate the electronic weighing balance before taking measurements.
• Clean all glassware with soap and distilled water.
• After completing the experiment, recap all reagent bottles.
• Switch off the lights, exhaust fan, and gas cylinder before leaving the lab.
• Discard used gloves in a designated waste bin.