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Question
What is meant by ‘surface activity’?
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Solution
The surface activity of a substance is the property by virtue of which it can spread on a surface. For example, soapy water easily spreads on any kind of surface and thus is used for cleaning purposes.
RELATED QUESTIONS
A student takes four test tubes marked P, Q, R and S of 25 mL capacity and fills 10 mL of distilled water in each. He dissolves one spoon full of four different salts in each as − KCl in P, NaCl in Q, CaCl2 in R and MgCl2 in S. He then adds about 2 mL of a sample of soap solution to each of the above test tubes. On shaking the contents of each of the test tubes, he is likely to observe a good amount of lather (foam) in the test tubes marked
(a) P and Q
(b) R and S
(c) P, Q and R
(d) P, Q and S
State one use of esterfication process.
Mention the essential material (chemicals) to prepare soap in the laboratory. Describe in brief the test of determining the nature (acidic/alkaline) of the reaction mixture of saponification reaction.
Explain esterification reaction with the help of a chemical equation. Describe an activity to show esterification.
State one advantage of soaps over detergents.
Why is soap not suitable for washing clothes when the water is hard?
The soap molecule has a ______.
Differentiate between:
Detergents and Soaps.
Soap is a salt of ______ and sodium hydroxide.
In the soap micelles
