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Question
What happens when crystalline Na2CO3 is heated?
Options
releases CO2
loses H2O
decomposes in NaHCO3
no change taken place
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Solution
Loses H2O
Explanation:
Crystalline sodium carbonate is washing soda:
Na2CO3⋅10H2O
When it is heated, it loses its water of crystallization and becomes anhydrous sodium carbonate:
\[\ce{Na2CO3 * 10H2O ->[heat] Na2CO3 + 10H2O}\]
No CO2 is released, and it does NOT decompose into NaHCO3.
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