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Homework Help: Water Hardness

  1. Sep 17, 2010 #1
    1. The problem statement, all variables and given/known data

    A sample of water is known to have 190 g/m^3 Ca2+ and 84 g/m^3 Mg2+. What is the hardness of the water in mg CaCO3/L?

    2. Relevant equations

    Hardness = (Ca2+) + (Mg2+)

    3. The attempt at a solution

    I need to convert my units into mg CaCO3/L or Normality before summing up the values. The problem is I do not understand how to convert to either.

    If I'm converting to mg CaCO3/L do I need a molar mass? And when do I use it?

    As for normality I do not understand what a "weight equivalence" is so I can't convert to that either.

    Thanks a lot.
  2. jcsd
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