Question

name the sodium compound which is used for softening hard water​

Answer 1

Answer:

Temporary hardness can be removed by boiling or by addition of Ca(OH)2. Permanent hardness can be removed by the addition of washing soda (Na2CO3. 10H2O), addition of sodium polymetaphosphate [calgon (NaPO3)n ] or by ion exchange method).

Answer 2

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Washing soda

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