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For a sample water with the ionic composition shown in the figure below, the carbonate and non-carbonate hardness concentrations (in mg/l as $CaCO_3$), respectively are:

  1. $200$ and $50$
  2. $175$ and $75$
  3. $75$ and $175$
  4. $50$ and $200$
in Water and Waste Water Quality and Treatment edited by
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