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CBSE Class 10 Answered

plz help me!
Asked by | 10 Mar, 2009, 12:43: PM
answered-by-expert Expert Answer

In hard water, calcium and magneisum salts are present.

Soap is sodium salt of long chain fatty acids.

When soap is used in hard water, it reacts with the calcium and magneisum salts and forms a precipitate ( which is soild) i.e. scum. And hence, foam or lather is not formed.

Answered by | 10 Mar, 2009, 04:52: PM
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