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By adding washing soda youcan removeO temporary hardness of waterhydrogen from waterpermanent de watersowat​

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ANSWER:

SODIUM carbonate, Na​2​ CO​3​ , is also known asа​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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