Question

    The hardness of water is usually expressed in terms of

    what unit?
    A Molarity Correct Answer Incorrect Answer
    B Normality Correct Answer Incorrect Answer
    C Parts per million (ppm) Correct Answer Incorrect Answer
    D Mole Correct Answer Incorrect Answer

    Solution

    Water hardness is typically measured in parts per million (ppm) of calcium carbonate, reflecting the concentration of calcium and magnesium ions.

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