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प्रश्न
Explain the process of preparation of soap in laboratory.
उत्तर
(a) Following is the process of preparing soap in the laboratory:
Raw materials required are:
(i) Vegetable oil like castor oil
(ii) Sodium hydroxide (caustic soda), and
(iii) Sodium chloride (common salt)
Steps involved in the preparation of soap are:
1. Take a beaker with about 20 ml of castor oil in it.
2. Also, add 30 ml of 20% sodium hydroxide to the beaker.
3. Heat the mixture and stir it constantly until a soap is formed.
4. Add 5-10 grams of common salt to it and stir the mixture. On cooling the solution, we will see the solid soap getting separated.
5. The solid soap, once separated, is made to set, and then it is cut into pieces called soap bars.
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संबंधित प्रश्न
While preparing soap a small quantity of common salt is generally added to the reaction mixture of vegetable oil and sodium hydroxide. Which one of the following may be the purpose of adding common salt?
(A) To reduce the basic nature of the soap
(B) To make the soap neutral
(C) To enhance the cleansing power of the soap
(D) To favour the precipitation of the soap
Which of the following sets of materials can be used for conducting a saponification reaction for the preparation of soap?
(a) Ca(OH)2 and neem oil
(b) NaOH and neem oil
(c) NaOH and mineral oil
(d) Ca(OH)2 and mineral oil
Would you be able to check if water is hard by using a detergent?
Fill in the following blank with suitable word:
The sodium salt of a long chain fatty acid is called .............
Why is common salt (sodium chloride) added during the preparation of soap?
Explain the cleansing action of soap. Draw diagrams to illustrate your answer.
The chemical mostly used in the preparation of most of the soaps we use is
(a) Sodium chloride
(b) Potassium hydroxide
(c) Sodium hydroxide
(a) Potassium chloride
What are the differences between Soap and synthetic detergent?
Water, coconut oil, and _______ are necessary for soap preparation.
Arrange the following statements in correct sequence
- Pour that solution into an empty matchbox, soap can be obtained after drying.
- Take the necessary quantity of water in a jar.
- Then add coconut oil drop by drop and stir it well.
- Add concentrated sodium hydroxide in the jar and allow it to cool.
- Try this soap to wash your hand kerchief.
- Cover your work area with old newspaper.
