InterviewSolution
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InterviewSolution
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Soaps do not work in hard water containing calcium and magnesium ions becauseA. `Ca^(2+) and Mg^(2+)` ion form insoluble calcium and magnesium salts in the form of scumB. `Na^(+) and K^(+)` present in soap react with `Ca^(2+) and Mg^(2+)` and hinder cleansing processC. a large amount of soap is to be used in presence of ` Ca^(2+) and Mg^(2+)`D. scum formed by combination of `Na^(+),Ca^(2+) and Mg^(2+)` stick to the cloth and are not removed on agitations. |
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Answer» Correct Answer - A `Ca^(+) and Mg^(2+)` ions from insoluble calcium and magnesium soaps respectively when sodium or potassium soaps are dissolved in hard water . `underset("Soap")(2C_(17)H_35)COONa+CaCl_(2) to underset(" Insoluble calcium stearate (soap)")(2NaCl+(C_(17)H_(35)COO)_(2)Ca)` These insoluble soaps separate as scum in water and are useless as cleansing agent . |
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