Removing hardness from water.
- 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.
- Soft water = no calcium/ magnesium ions.
- 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.
- Soft water = no calcium/ magnesium ions.
- 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.
- Removing hardness
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