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Why do we add alum to purify water ?...

Why do we add alum to purify water ?

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Muddy water contains mud particles which are colloidal in nature and carry charge. Alum provides `AL^(3+)` ions which bring about coagulation of mud particles which settle down.
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  3. Why do we add alum to purify water ?

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  12. On the basis of Hardy-schulze rule explain why the coagulating power o...

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