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Explain the cleaning action of soap . Why do soaps not work in hard water ? |
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Answer» SOLUTION :Soap is sodium or potassium slat of a higher FATTY acid and MAY be represented as `RCOO^(-) Na^(+)` e.g., sodium STEARATE `CH_(3)(CH_(2))_(16) COO^(-)Na^(+)` . When dissolved in water , it dissociates into `RCOO^(-)` and `Na^(+)` ions. The `RCOO^(-)` ions , Hard water contains calcium and magnesium salts . In hard water , soaps get precipitated as calcium and magnesium soap which being insolublestick to the clothes as gummy mass . The cleaning action of soap is due to the FACT that soap molecules form micelle around the oil droplets in such a waythat hydrophobic part . |
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