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    Question

    What is the term used for the process of removing

    calcium and magnesium from hardwater? 
    A Filtration Correct Answer Incorrect Answer
    B Distillation Correct Answer Incorrect Answer
    C Sedimentation Correct Answer Incorrect Answer
    D Water Softening Correct Answer Incorrect Answer

    Solution

    Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted mopping up calcium ions.

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