InterviewSolution
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Explain the action of soap and detergent in removing dirt form fabrics. |
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Answer» When the soap molecules come in contact with water, the non-ionic part of a soap molecule attaches itself to the dirt on the fabric because the dirt is miscible in it. The ionic part remains in the water. The dirt is removed when clothes are rinsed many times with soap in clean water. When a detergent is added to water, the detergent molecules increase the surface tension of the water and penetrate in between the dirt and the fabric, where water alone cannot enter. The scrubbing action helps in moving the detergent deeper inside the fabric and makes the dirt float on the solution. The dirt hangs on the tail of the detergent molecule and is removed by movement of water particles during rinsing. |
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