Why do we add alum to purify water?
NCERT Class XII
Chemistry - Exemplar Problems
Chapter 5. Surface Chemistry
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as alum coagulates the colloidal properties present in water,so these impurities settle down and removed by filtration.
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Explanation:
- The alum is added to purify water because the coagulation of dust particles from the water is made possible.
- The impurities settle down and removes the dust particles forming the decantation or filtration. Thus its purify the water.
- The increased size as well as lack of repelling charge the alum to settle down in the bottom or rice up and 'float in the water'. These forces are called 'van der waals force'.
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