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.
Bottle |
Name of the Oil |
Time taken for the separation of two layers |
Without soap (in s) |
With soap (in s) |
A |
Castor oil |
|
|
B |
Cotton seed oil |
|
|
C |
Coconut oil |
|
|
D |
Kerosene oil |
|
|
E |
Mustard oil |
|
|
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.