8. How is hard water converted to soft water?
9. Why are detergents preferred to soaps while using hard water?
1o. Name the compound that must be added to water to remove hardness.
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8. Sodium carbonate (Na2CO3), also known as washing soda, can soften both temporary and permanent hard water. It is soluble in water and adds a large amount of carbonate ions to the water.
9. Unlike soaps, detergents can be used even in hard water because unlike sodium salts, calcium and magnesium salts of sulphonic acids are soluble in water.
10. sodium carbonate (soda ash).
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