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Question
What is the advantage of detergents over soaps for washing clothes? Also state one disadvantage.
Solution
Advantages of detergents over soaps:
(1) Detergents can be used with hard water, while soaps cannot be used with hard water.
(2) The cleansing action of detergents is stronger than soaps.
(3) Detergents have a greater solubility in water as compared to soaps.
Disadvantage of detergents:
(1) Some detergents are not bio-degradable; therefore, they pollute water bodies like lakes and rivers. Soaps, on the other hand, are bio-degradable and don't cause water pollution.
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RELATED QUESTIONS
Differentiate between Toilet soap and Laundry soap.
What change will you observe if you test soap solution with a litmus paper (red and blue)? Give reason for your observation.
Which of the two is better for washing clothes when the water is hard: soap or detergent? Give reason for your answer.
The chemical which is not required for the preparation of soap in the laboratory is:
(a) vegetable oil
(b) baking soda
(c) caustic soda
(d) common salt
Which one of the following sets of materials can be used to prepare soap?
(A) Neem oil and calcium hydroxide
(B) Castor oil and sodium hydroxide
(C) Mineral oil and sodium hydroxide
(D) Neem oil and magnesium hydroxide
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 is a soap?
Answer the following question.
In three test tubes A, B, and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap Answer is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.
How does soap clean clothes?
______ molecules go and join with dirt and oil in the cloth.
