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CBSE Class 10 Answered

what is hardness of water
Asked by nitinkanyal20 | 18 May, 2020, 07:54: AM
Expert Answer
Hard water is the one which has high mineral content. 
Water hardness is a measure of the amount of calcium and magnesium salts in water.
 
Water is said to be hard when it does not readily form lather with soap.
1.Temporary Hardness:

    Water which contains only hydrogen carbonates of calcium and magnesium is called temporary hard water.

    Its hardness canbe removed by just boiling.

2.Permanent Hardness:

   Water containing sulphates and chloride of magnesium and calcium is called permanent hard water.

   This hardness cannot be removed by boiling.

Answered by Varsha | 18 May, 2020, 11:55: AM

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