what is hard water?
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Yogita Ingle 7 years, 6 months ago
Water can be classified as soft and hard water based on the type of dissolved salts and behavior with soaps.
(i) Soft water: Soft water lathers easily with soap and contains few or no calcium or magnesium metal. A good example of soft water is rain water.
(ii) Hard water: Hard water does not produce lather with soap, form scum and cannot be used for laundry. Ex: River, sea and sometimes even well water.
Hard water is classified into 2 types:
Temporary hard water: A sample water which form scum with soap, but on boiling and then treating with soap produce leather is called temporary hard water.
Permanent hard water: A sample of water which form scum with soap even boiling is called permanent hard water.
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