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If water contains dissolved calcium hydrogencarbonate, out of soaps and synthetic detergents, which one will you use for cleaning clothes ? |
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Answer» Solution :Water containing calcium hydrogen CARBONATE is hard water. Calcium ions react with soap to form calcium salts of soap which are insoluble. They form a gummy mass and stick to the clothes. This difficulty does not arise when we use detergents because calcium salts of detergents are soluble in water. `underset("Soluble in water")underset("SODIUM STEARATE (soap)")(2C_(17)H_(35)COONa)+ Ca(HCO_(3))_(2) RARR underset("(insoluble)")underset("Calcium stearate")((C_(17)H_(35)COO)_(2)Ca)+2NaHCO_(3)` 
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