how does alum help in sedimentation of water and purify it
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An alum is a type of chemical compound, usually a hydrated double sulfate salt of aluminium with the general formula XAl ₂·12H ₂O, where X is a monovalent cation such as potassium or ammonium. By itself, "alum" often refers to potassium alum, with the formula KAl ₂·12H ₂O.
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Alum helps in sedimentation of water as when we put alum in dirty water all the undesirable mud particles gradually stick to the alum and this is how a alum helps in sedimentation.
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