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Q.4 Explain why it is difficult to wash clothes withsoap when water is hard. How do detergentshelp in overcoming this problem?Board Term-II, 2012] |
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Answer» Whensoapis added tohard water, the Ca2+ and Mg2+ ions present inhard waterreact withsoap. The sodium salts present insoapsare converted to their corresponding calcium and magnesium salts which are precipitated as scum. The insoluble scum sticks on theclothesand so the cleaning capacity ofsoapis reduced. Detergents do not form lather with hard water. Hence, they overcome this problem. Please hit the like button if this helped you |
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