NCERT In-text 4.5 — Q1 - Carbon and its Compounds
Question: Would you be able to check if water is hard by using a detergent?
Answer: 1. No, a detergent CANNOT be used to check if water is hard. 2. Hard water contains dissolved calcium (Ca²⁺) and magnesium (Mg²⁺) salts. 3. When SOAP is added to hard water, it reacts with Ca²⁺ and...
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