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How is washing soda prepared from sodium...

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 which can be removed by it?

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Washing soda is prepared from sodium carbonate by recrystallisation
`Na_(2) CO_(3) + 10 H_(2) O to Na_(2) CO_(3) . 10 H_(2) O`
Washing soda is a basic salt. It is used for removing permanent handness of water
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