Alum is used in cleaning water …
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Yogita Ingle 7 years ago
As alum coagulates the colloidal properties present in water, so these impurities settle down and removed by filtration.
The increased size as well as the lack of repelling charges cause the alum particles to settle down at the bottom or rise up and float in the water.
After the particles are neutralized, they clump together because of the London Dispersion Force which are part of the Van der Waals forces. Basically, weak intermolecular force arising from quantum-induced instantaneous polarization multipoles in molecules causes even nonpolar particles to attract each other due to the correlated movements of the electrons in interacting molecules. Then they settles down.
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