Question

permanent hardness doen't removed by_____​

Answer 1

Answer:

Permanent hardness of water can be removed by Washing Soda

and cannot be removed by common salt.

Explanation:

Answer 2

Answer:

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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