Experiment No: 01
Aim: To detect the presence of lipids using differential solubility in polar and non-polar
solvents.
Principle: The principle of the experiment is based on the concept of solubility, specifically
the interaction between polar and non-polar substances. Lipids, being non-polar molecules,
do not dissolve in polar solvents like water but can dissolve in non-polar solvents such as
chloroform. By observing the solubility of oil (a lipid) in different solvents—water, ethanol,
and chloroform—the experiment demonstrates the varying degrees of interaction between the
lipid and each solvent, thereby confirming the lipid's non-polar nature.
Materials Required:
1. Test Tubes
2. Micropipette
3. Pipette Tips
4. Oil (Almond Oil)
5. Distilled Water
6. Ethanol
7. Chloroform
Procedure:
1. Thoroughly cleanse the test tubes with distilled water, ensuring the removal of any
contaminants. Dry the test tubes by placing them in a hot air oven for 15 minutes at
120°C to eliminate any residual moisture.
2. Using a sterile micropipette, carefully distribute equal amounts of almond oil into three
separate test tubes.
3. In test tube A, add distilled water and mix vigorously to ensure proper interaction between
the oil and water. Observe the behaviour of the oil. In test tube B, add ethanol and mix
thoroughly. Observe the extent of oil solubility. In test tube C, add chloroform and mix
until a homogenous solution is observed. Note the complete dissolution of the oil.
Observations:
Test Tube A:* The oil did not dissolve in water, remaining as a distinct layer on top of the
water. This indicates the immiscibility of the non-polar oil in the polar solvent, water.
Test Tube B:* The oil exhibited partial solubility in ethanol, forming a separate layer.
This is consistent with ethanol's mild polarity, which allows limited interaction with the
nonpolar oil.
Test Tube C:* The oil completely dissolved in chloroform, resulting in a uniform
solution. Chloroform, being a non-polar solvent, is highly compatible with the non-polar
nature of the oil.
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Aim: To detect the presence of lipids using differential solubility in polar and non-polar
solvents.
Principle: The principle of the experiment is based on the concept of solubility, specifically
the interaction between polar and non-polar substances. Lipids, being non-polar molecules,
do not dissolve in polar solvents like water but can dissolve in non-polar solvents such as
chloroform. By observing the solubility of oil (a lipid) in different solvents—water, ethanol,
and chloroform—the experiment demonstrates the varying degrees of interaction between the
lipid and each solvent, thereby confirming the lipid's non-polar nature.
Materials Required:
1. Test Tubes
2. Micropipette
3. Pipette Tips
4. Oil (Almond Oil)
5. Distilled Water
6. Ethanol
7. Chloroform
Procedure:
1. Thoroughly cleanse the test tubes with distilled water, ensuring the removal of any
contaminants. Dry the test tubes by placing them in a hot air oven for 15 minutes at
120°C to eliminate any residual moisture.
2. Using a sterile micropipette, carefully distribute equal amounts of almond oil into three
separate test tubes.
3. In test tube A, add distilled water and mix vigorously to ensure proper interaction between
the oil and water. Observe the behaviour of the oil. In test tube B, add ethanol and mix
thoroughly. Observe the extent of oil solubility. In test tube C, add chloroform and mix
until a homogenous solution is observed. Note the complete dissolution of the oil.
Observations:
Test Tube A:* The oil did not dissolve in water, remaining as a distinct layer on top of the
water. This indicates the immiscibility of the non-polar oil in the polar solvent, water.
Test Tube B:* The oil exhibited partial solubility in ethanol, forming a separate layer.
This is consistent with ethanol's mild polarity, which allows limited interaction with the
nonpolar oil.
Test Tube C:* The oil completely dissolved in chloroform, resulting in a uniform
solution. Chloroform, being a non-polar solvent, is highly compatible with the non-polar
nature of the oil.
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