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प्रश्न
Why do soaps not work effectively in hard water?
एका वाक्यात उत्तर
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उत्तर
Calcium and magnesium ions can be found in hard water. In hard water, these ions displace sodium or potassium from the salts that make up soaps, forming insoluble calcium or magnesium salts of fatty acids. As scum, these insoluble salts separate. This explains why soap does not dissolve in hard water.
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