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Chemistry In Everyday Life

Question

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If water contains dissolved calcium bicarbonate, out of soaps and synthetic detergents which one will you use for cleaning clothes?

Solution

Calcium hydrogen carbonate present in water will furnish Ca²⁺ ions which cause hardness in water.
calcium ion form insoluble calcium soaps respectively when sodium potassium soaps are dissolved in hard water.
2C₁₇H₃₅COONa --> 2NaCl + (C₁₇H₃₅COO)₂Ca
^{Soap insoluble calcium stearate}
Therefore, soaps cannot be used to clean clothes with such water.

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