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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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Knowledge Check

  • Alum helps purifying water by

    A
    forming Si complex with clay particles
    B
    sulphate part which combines with the dirt and removes it
    C
    aluminium which coagulates the mud particles
    D
    making mud water soluble

  • The alum used for purifying water is

    A
    Ferric alum
    B
    Chrome alum
    C
    Potash alum
    D
    Ammonium alum.

  • The alum used for purifying water is

    A
    ferric alum
    B
    chrome alum
    C
    potash alum
    D
    ammonium alum

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    Potash alum is used to purify water.

    Explain the utlity of alum for purifying water.

    The alum used for purifying water is

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    The alum used for purifying water is

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