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      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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