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What is Soap ?Why are soaps are not suitable for washing clothes with hard water? Explain the action of soap in removing an oil dish. |
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Answer» Soap : It is sodium or potassium salt of fatty acid.Hard water contains bicarbonates, chlorides and sulphates of calcium and magnesium which react with soap molecules forming insoluble precipitates called scum. Hence, strength of soap molecules are lost in the chemical reaction and they are not available for cleansing action. The dirt present on clothes is organic in nature and insoluble in water. Therefore, it cannot be removed by only washing with water. When soap is dissolved in water, its hydrophobic ends attach themselves to the dirt and remove it from the cloth. Then, the molecules of soap arrange themselves in micelle formation and trap the dirt at the centre of the cluster. These micelles remain suspended in the water. Hence, the dust particles are easily rinsed away by water. |
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