Advertisements
Advertisements
Question
Explain why synthetic detergents are superior to soap.
Solution
Synthetic detergents are superior to soap because synthetic detergents work both in soft water and hard water. In contrast, soaps work only in soft water and they are not effective in hard water.
RELATED QUESTIONS
Describe in brief the cleansing action of soap.
A student takes about 4 ml of distilled water in four test tubes marked P, Q, R and S. He then dissolves in each test tube an equal amount of one salt in one test tube, namely sodium sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds an equal amount of soap solution in each test tube. On shaking each of these test tubes well, he observes a good amount of lather (foam) in the test tube marked
(A) P and Q
(B) Q and R
(C) P, Q and S
(D) P, R and S
Explain the formation of scum when hard water is treated with soap.
Fill in the following blank with suitable word:
The sodium salt of a long chain fatty acid is called .............
Why have detergents replaced soap as a washing agent?
What is saponification? Write the chemical equation of the reaction involved in this process. Name all the substances which take part in this process and also those which are formed.
What is a soap? Name one soap.
Describe the structure of a soap molecule with the help of a diagram.
How will you check with the help of soap powder whether water is hard?
Explain why soap cannot be used in hard water.
