Chapter 28: Detergents

All the following "answers" are for your reference only!

The "best" answers are based on your actual experimental results!

 

Experiment 28.1: Testing the properties of detergent

Part A: Testing its wetting ability

3.   It remains as a spherical drop.

It flattens and wets the cotton fabric.

4.   Detergent.

 

Part B: Testing its emulsifying ability

5.   2 layers are formed once more.

8.   In the test tube containing just water and oil, 2 layers are formed.

In the tube containing detergent, a milky liquid is formed.

9.   Detergent acts as an emulsifying agent.

10. can; wetting

can; emulsifying

 

Experiment 28.2: To make soap and to test some of its properties

Part B: To test some of the properties of soap

1.   Two

2.   One. Yes.

3.   Bubbles and foams are formed.

4.   a)  A grey solid forms.

b)  A grey solid forms.

9.   emulsifying; lather; scum

 

Experiment 28.3: To compare a soap and a soapless detergent

2.   About the same / the one with soap.

4.   It remains clear with a good lather.

It turns cloudy and a scum is formed.

5.   soft; soap; soapless detergents.