Question

. Abhishek performs 2 sets of experiments to study the length of the foam formed which are as follow:
Set I : she takes 10ml of distilled water in a test tube "A" and adds 5-6 drops of liquid soap in it and
shakes the test tube vigorously.
Set II : She takes 10ml of distilled water in 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 observations and reason.

Answer 1

2nd test tube forms scum. It is hard water.

Pls mark brainliest.

Answer 2

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.