Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 8th

Removal of Hardness of Water

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  • Softening of water
  1. Removal of temporary hardness
    a) By boiling
    b) Clark's method
  2. Removal of permanent hardness
    a) By washing soda method
    b) lon-exchange/Permutit method
    c) Calgon method
    d) Synthetic resins method
    ⇒ Ion exchange resins are of two types
    i) Cation exchange resins
    ii) Anion exchange resins
  • Degree of hardness of water
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