Explain the Formation of Scum When Hard Water is Treated with Soap. - Science

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Explain the formation of scum when hard water is treated with soap.

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Solution 1

Hard water often contains salts of calcium and magnesium. Soap molecules react with the salts of calcium and magnesium and form a precipitate. This precipitate begins floating as an off-white layer over water. This layer is called scum. Soaps lose their cleansing property in hard water because of formation of scum.

Solution 2

Scum is formed when a soap is used in hard water. This happens because a large amount of soap is utilised in reacting with the magnesium and calcium ions of hard water. An insoluble curdy precipitate, scum, sticks to the clothes making them difficult to be cleaned.

Concept: Soap
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Chapter 4: Carbon And Its Compounds - Exercise 3 [Page 264]


Lakhmir Singh Class 10 Chemistry (Science)
Chapter 4 Carbon And Its Compounds
Exercise 3 | Q 41.3 | Page 264
NCERT Class 10 Science
Chapter 4 Carbon and its Compounds
Exercises | Q 10 | Page 78

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