Question

Take about 10 mL of water each in two test tubes.Add a drop of oil (cooking oil) to both the test tubesand label them as A and B.To test tube B, add a few drops of soap solution.Now shake both the test tubes vigourously forthe same period of time.Can you see the oil and water layers separatelyin both the test tubes immediately after youstop shaking them?Leave the test tubes undisturbed for some timeand observe. Does the oil layer separate out?In wch test tube does ts happen first

Answer 1

In test tube A the oil and water will be seen seperate quickly than test tube B . It is because in test tube B soap solution is added and we know that soap solution reacts with dirt or oil.
a soap particle has two ends one hydrophilic and the other hydrophobic. one end reacts with water and the other reacts with oil . so the oil and water will not be seen seperate instantly rather a considerable foam will be seen between the interface of oil and water.

Answer 2

both test tubes have different amount if foam
in soap solution test tube Curdy solid is formed as detergent works in both hard water and soft water but soap works in only soft water. so there would be less foam
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