There are two types of hard water:
- Permanent hard water remains hard when boiled
- Temporary hard water is softened by boiling and contains hydrogencarbonate ions (HCO3-) that decompose when heated to produce carbonate ions which react with calcium and magnesium ions to form precipitates
Hard water can be made soft by removing the dissolved calcium and magnesium ions which can be done by:
- Adding sodium carbonate which reacts with the calcium and magnesium ions to form a precipitate of calcium carbonate and magnesium carbonate
- Using commercial water softeners such as ion exchange columns whcih replace the calcium and magnesium ions when hard water passes through the column
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