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Foaming Capacity of Soap Viva Questions


Foaming Capacity of Soap Viva Questions and Answers

1. What are soaps?


Soaps are sodium (Na) or potassium (K) salts of higher fatty acids such as stearic acid, palmitic acid and so on. Soap produces foam when shaken with water. This foam is responsible for the removal of dirt. A soap which produces more foam is more efficient in cleansing.


2.  Name two higher fatty acids.


Stearic acid and palmitic acid


3. Why are soaps soluble in water?


Being alkali metal salts, soaps are soluble in water.


4. How will you compare the foaming capacities of two varieties of soap?


By shaking equal masses of the two samples of soaps in equal volumes of water and then by measuring the time taken for the disappearance of the foam that is formed.


5. By knowing the foaming capacity how will you determine the quality of a soap?


The soap which has maximum foaming capacity is the best brand of soap.


6. What is the use of foam?


It is used to remove dirt.


7. What is hard water?


Hard water is the water that does not lather easily with soap.


8. How is hardness of water classified?


Temporary hardness and Permanent hardness


9. Name two sources of soft water?


Rain water, boiled water


10. Name two sources of hard water?


Ground water, sea water


11. Name the cleansing agent that can be used in hard water?


Detergents


12. Give two salts present in water?


Magnesium sulphate, Sodium chloride


13. Name two parts of a soap molecule.


Ionic (hydrophilic) and non-ionic (hydrophobic)


14. Examples of dissolved salts present in hard water?


Hydrogen carbonates, sulphates and chlorides of Ca or Mg. These, on boiling decompose and precipitates as their carbonates.


15. What is a micelle?

When soap molecules are dissolved in water they form a shape as shown in figure. The shape formed is called micelle. The ionic ends will points outside the water and the non ionic end will points towards the oil.


16. Aim of Foaming capacity of different soaps experiment.


The main objective of Foaming capacity of different soaps experiment is to compare the foaming capacities of different brands of soaps available in the market.


17. Apparatus required for Foaming capacity of different soaps experiment.


250 mL conical flasks, Numbered test tubes, Different types of soaps, Stop watch


18. Working Principle of Foaming capacity of different soaps experiment.


Solutions of different soaps are prepared by dissolving equal masses of the soaps in equal volumes of water. They are shaken vigorously to produce foam and then they are allowed to stand. The time taken for the disappearance of the foam is measured for the different samples. The soap, which takes maximum time for the disappearance of the foam has the maximum foaming capacity and it is the best soap.


19. Procedure of Foaming capacity of different soaps experiment.


Dissolve 0.5g each of the different samples of the soap in 50 mL of distilled water taken in different conical flasks labeled 1, 2, 3, 4,….. etc. Now take test tubes labeled 1, 2, 3, 4,…. Etc and add 10 mL distilled water to each of them. Add 1 mL each of the soap solution from conical flasks 1, 2, 3, 4,….. etc to test tubes 1, 2, 3, 4,….. etc respectively. Cork test tube 1 and shake for one minute. Place the test tube in the test tube stand and note the time in which the foam just disappears. Similarly, note the time for the disappearance of the foam in the other test tubes and record the data.

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