Chemistry
Grade-7
Easy
Question
_______ will not dissolve in saline water or hard water.
- Soaps
- Detergents
- Oils
- Acids
Hint:
Soap can't work well in water with minerals.
The correct answer is: Soaps
Soap will not dissolve in saline water or hard water.
Hard water contains calcium and magnesium salts. When soap dissolves in hard water, these ions displace sodium and potassium from salts, forming insoluble calcium and magnesium salts of fatty acids. These insoluble salts separate as foam. That's why soap can't be used in hard water.
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