Question

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.

Answer 1

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.