Name the salt used for removing the permanent hardness of the water

1.	Name the salt used for removing the permanent hardness of the water
Answer» Sodium carbonate,\xa0Na2CO3, 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. Washing soda washing soda NaCo3 Washing soda

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