Chemistry
Grade-7
Easy
Question
Which one of the following is correct?
- Only soft water is utilized when using soaps and detergents.
- Both soaps and detergents are used with both hard and soft water.
- Detergent can be used in both soft and hard water; however, soap must be used in soft water.
- Soap can be used in both soft and hard water; however, detergent should only be used in soft water.
Hint:
Detergent can work well in mineral deficient water too. Soap works only in mineral deficient water.
The correct answer is: Detergent can be used in both soft and hard water; however, soap must be used in soft water.
- The statement "Detergent can be used in both soft and hard water; however, soap must be used in soft water" is correct.
- Synthetic detergents are cleaning agents that have all the properties of soap but do not actually contain soap. It can be used in both soft and hard water, as it produces bubbles even in hard water.
- Soap will not work in hard water, but detergent can be used in both hard and soft water. This is because hard water contains calcium and magnesium ions.
- When hard water and soap are mixed, the magnesium ions react with the soap molecules to form an insoluble solid called precipitate.
- This precipitate (foam) reduces the soap's ability to form suds.
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