Removing hardness from water.

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  • Created by: Sneha
  • Created on: 13-03-13 17:51
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  • Removing hardness
    • Soft water = no calcium/ magnesium ions.
      • Don't waste soap.
      • No scale or scum formed.
      • important in industrial processes.
        • Hardness produces scale in boilers.
    • Boiling
      • Water that can have hardness removed by boiling is called temporary hard water.
      • Doesn't work with permanent hard water.
    • Washing soda
      • (adding sodium carbonate to it)
      • soluble carbonate ions precipitate out with calcium or magnesium (calcium/ magnesium carbonate)
        • calcium/ magnesium carbonate is insoluble.
  • Ion Exchange Columns
    • Removing hardness
      • Soft water = no calcium/ magnesium ions.
        • Don't waste soap.
        • No scale or scum formed.
        • important in industrial processes.
          • Hardness produces scale in boilers.
      • Boiling
        • Water that can have hardness removed by boiling is called temporary hard water.
        • Doesn't work with permanent hard water.
      • Washing soda
        • (adding sodium carbonate to it)
        • soluble carbonate ions precipitate out with calcium or magnesium (calcium/ magnesium carbonate)
          • calcium/ magnesium carbonate is insoluble.
    • Resin packed with sodium ions. These displace Ca/ Mg ions in the water.
    • Resin recharged with sodium ions after exchanged.
      • Washed with salt solution for sodium back on resins.

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