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The formula of soda ash is

1. ${Na}_{2} {CO}_{3} \cdot 10 H_{2} O$

2. ${Na}_{2} {CO}_{3} \cdot 2 H_{2} O$

3. ${Na}_{2} {CO}_{3} \cdot H_{2} O$

4. ${Na}_{2} {CO}_{3}$

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