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What cause hardness of water  

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What cause hardness of water

 

    • Posted by Satish Nehra 7 years ago

    CBSE > Class 10 > Science
    • 1 answers

    Naveen Sharma 7 years ago

    Ans. Hard water contains dissolved magnesium and calcium ions. These make it more difficult for the water to form a lather with soap.

    • Temporary hardness is caused by dissolved calcium hydrogencarbonate (which is removed by boiling).
    • Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling).

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