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Washing soda has formula

1. Na2CO3·7H2O
2. Na2CO3·10H2O
3. Na2CO3·3H2O
4. Na2CO3

Correct answer: Na2CO3·10H2O

Solution

Washing soda is sodium carbonate decahydrate, with the formula Na2CO3·10H2O. It is a common hydrated salt used in cleaning applications.

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