difference between permanent hardness and temporary hardness of water
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Hard water contains dissolved magnesium and calcium ions. These make it more difficult for the water to form a lather with soap. Temporary hardness is caused by dissolved calcium hydrogen carbonate (which is removed by boiling). Permanent hardness is caused by dissolved calcium sulfate (which is not removed by boiling).
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permanent hardness is caused by sulphates and chloride of magnesium and calcium
temporary hardness is caused by calcium carbonate and magnesium carbonate
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