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Riya performs two set of experiments to study the length of the foam formed which are as follows:

Monjur Alahi

Riya performs two set of experiments to study the length of the foam formed which are as follows: 

Set I: She takes 10 mL of distilled water in test tube ‘A’ and adds 5-6 drops of liquid soap in it and shakes the test tube vigorously. 

Set II: She takes 10 mL of distilled water in a test tube ‘A’ and adds 5-6 drops of liquid soap with half spoonful of CaSO4 in it and shakes the test tube. Write your observation and reason.


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Salim Ahmed Kawsar

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Set I will have more length of foam because it consists of soft water. 

Set II will form less foam because it consists of hard water due to the presence of CaSO4.

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