Chemistry
Grade-7
Easy
Question
In comparison to soft water, the cleaning power of soap is less effective in hard
water.
Which of the following best explains the preceding assertion?
- In hard water, soap is less soluble.
- In hard water, soap only partially dissociates.
- With calcium and magnesium ions, soap creates an insoluble salt.
- When combined with the aluminum ion found in hard water, soap particles create complex ions.
Hint:
Soap in hard water forms scum which reduces its ability to clean.
The correct answer is: With calcium and magnesium ions, soap creates an insoluble salt.
- Hard water contains calcium and magnesium ions.
- When soap comes into contact with hard water, these ions form calcium and magnesium salts of water-insoluble fatty acids.
- These calcium or magnesium salts precipitate as foam.
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