InterviewSolution
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InterviewSolution
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o. Why soaps cannot be used with hard water ? |
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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 the clothes and so the cleaning capacity ofsoapis reduced |
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