Name the purification method in which potash alum is added to the water and state why potash alum is added to water?
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Alum, also known as aluminium sulfate is added to water in order to destabilize the mud particles suspended in it. This process is known as coagulation.
Alum helps in purifying water by aluminium which coagulates the mud particles. Because of the high charge on the aluminium ion (Al
+3
), it helps the small particles of suspended solids to group together until they are of such size that they sink and can be removd
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