Materials Required

• Castor oil
• Cotton seed oil
• Coconut oil
• Kerosene oil
• Mustard oil
• 1% soap solution
• 5 ml pipettes
• 5 stoppered bottles
• Measuring cylinders
• Stop watch

Procedure

Real Lab Procedure

• Take 5 clean stoppered bottles labelled as A, B, C, D and E.
• Take 5 ml of castor oil in bottle A, 5 ml of cotton seed oil in bottle B, 5 ml of coconut oil in bottle C, 5 ml of kerosene oil in bottle D and 5 ml of mustard oil in bottle E.
• Add 50 ml of distilled water to each bottle.
• Take bottle A, stopper it and shake vigorously for one minute and then allow it to stand.
• Note down the time taken for the two layers to separate out.
• Similarly take the bottles B, C, D and E and note the time taken for the separation of the two layers in each case.
• Now add 10 drops of 1% soap solution to bottle A and note down the time taken for the separation of the two layers.
• Similarly add 10 drops of 1% soap solution to the other bottles and note down the time taken for the separation of the two layers.

Simulator Procedure (as performed through the Online Labs)

• You can select the oil from ‘Select the oil’ drop down list.
• You can select the emulsifying agent from ‘Select the emulsifying agent’ drop down list.
• You can select the volume of oil using the slider.
• You can select the volume of water using the slider.
• You can select the number of drops of the emulsifying agent using the slider.
• Drag the measuring jar to the bottle to add water to oil.
• Drag the bottle to shake it for 1 minute.
• You can see the separation of oil layer from the water layer.
• You can measure the time taken for the separation of two layers (oil layer and water layer) from the stopwatch.
• Drag the dropper to the beaker to take the emulsifying agent in it and drag it to the bottle to drop the emulsifying agent into the bottle.
• Drag the bottle to shake it for 1 minute.
• You can see the separation of oil layer from the water layer.
• You can measure the time taken for the separation of two layers (oil layer and water layer) from the stopwatch.
• To redo the experiment, click on the ‘Reset’ button.

Note: Click on the 'HELP' button to see the instructions.
 

Observations

Observations can be recorded as shown.

Precautions

• Add equal number of drops of soap solution to all the bottles.
• Each bottle should be shaken vigorously and for the same time.
• The time should be recorded carefully.
• Start the stopwatch immediately after shaking is stopped and stop it immediately when the two layers just separate.