Removing Hardness From Hard Water


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  • Created by: izzy
  • Created on: 06-07-12 10:51

Use washing soda. (sodium carbonate)

  • This precipitates out the hardness as insoluble carbonates.

Ca^2+(aq) + CO3^2-(aq) = CaCO3(s)2

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Use an ion exchange column.

  • These columns contain sodium ions that are exchanged for calcuim and magnesium ions when they pass through them.
    • Once all of the sodium ions are exchanges, the resin is washed with salt solution to give it more sodium ions.
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