Name the sodium compound which is used for softening hard water.

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Question.
Name the sodium compound which is used for softening hard water.

solution:
Washing soda $\left(\mathrm{Na}_{2} \mathrm{CO}_{3} \cdot 10 \mathrm{H}_{2} \mathrm{O}\right)$ is used for softening hard water.

Name the sodium compound