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Carbon and its Compounds — Science STD 10 — Question

Tamilnadu BoardEnglish MediumSTD 10ScienceCarbon and its Compounds2 Marks
Question
Why ordinary soap is not suitable for use with hard water?
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Answer

Ordinary soaps when treated with hard water, precipitate as salts of calcium and magnesium. They appear at the surface of the cloth as sticky grey scum. Thus, the soaps cannot be used conveniently in hard water.

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