Question

Adding alum to water cleans water

Answer 1

Answer:

When alum (Aluminium Sulphate) is added to raw water, it reacts with the bicarbonate alkalinities present in the water and forms a gelatinous precipitate. This floc attracts other fine particles and suspended material in raw water, and settles down at the bottom of the container. The water over this sediment is almost clean other than some fine particles dissolved in it. Alum is in a crystallized form that you can powder and store in a clean glass container. This removes the fine particles from water which may or may not be removed from water using another process. It leads to reduces the hardness in water.

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