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प्रश्न
How is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt. Name the type of hardness of water that can be removed by it?
रासायनिक समीकरणे/रचना
लघु उत्तर
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उत्तर
Washing soda is prepared from sodium carbonate by recrystallization.
\[\ce{\underset{\text{Sodium carbonate}}{Na2CO3}+{10H_2O}->\underset{\text{Washing soda}}{Na2CO3.10H2O}}\]
Washing soda is a basic salt. It is used to eliminate the permanent hardness of water.
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