Question

23 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. 2 m

Answer 1

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

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

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Answer 2

Explanation:

In the set I large amount of foam will be produced as water is soft. But  in set II very less amount of foam will be produced as calcium sulphate is added to water so water becomes hard.