Name the sodium compound which is used for softening hard water.
Name the sodium compound which is used for softening hard water.
- A
$ Mg(OH)_2 $
- B
$ Ca{(OH)} _{3} $
- C
$Al_{2} O _{3} $
- D
$Na _{2} CO _{3} \cdot 10 H _{2} O$
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