Alum (Potassium aluminum sulfate) is used as a coagulating agent in water purification. When added to muddy water, it dissolves and forms positively charged ions that neutralize the negative charges on the suspended clay and silt particles. This neutralization causes the fine particles to clump together into larger, heavier aggregates called flocs, which then settle down or can be easily filtered out.
By which process Alum cleans the muddy water:
Asked in RPSC RAS Prelims 2008 · Topic: Physical and Chemical Changes, Solution (Distinguishing Solutions, Colloids, and Suspensions)
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