What exactly do you mean by permanent hardness of water?
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Water can be soft or hard based on its mineral content. Hard water contains a significant amount of dissolved minerals where as soft water does not.
A type of hardness that can be removed by boiling is called temporary hardness. Hardness of water can't be removed by boiling is called permanent hardness.
A type of hardness that can be removed by boiling is called temporary hardness. Hardness of water can't be removed by boiling is called permanent hardness.
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