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Give the difference between temporary hardness and permanent hardness 

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SL NOTEMPORARY HARDNESSPERMANENT HARDNESS
1It is due to the presence of magnesium and calcium bicarbonates.It is due to the presence of salts of magnesium and calcium in the form of their chlorides and sulphates
2It can be removed by boiling or by adding slaked lime to hard waterIt can be removed by treating with Na2CO3 or by ion exchange method

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