name the salt of sodium which is used to remove permanent hardness of water that give its molecular formula
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Sodium carbonate, Na2CO3, is also known as washing soda. It can remove temporary and permanent hardness from water. Sodium carbonate is soluble but calcium carbonate and magnesium carbonate are insoluble. The water is softened because it no longer contains dissolved calcium ions and magnesium ions.
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Answer:Sodium Carbonate decahydrate, Na2CO3.10H2O
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