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Question

How would you distinguish between baking powder and washing soda by heating?

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Solution

The production of carbon dioxide is a characteristic difference observed during the heating of baking powder and washing soda. Baking powder, on heating, produces sodium carbonate, carbon dioxide gas, and water.

2NaHCO3(s)HeatNa2CO3(s)+CO2(g)+H2O(l)

Similarly, when washing soda (Na2CO3) is heated, it does not produce carbon dioxide. It loses its water of crystallisation and becomes anhydrous.

Na2CO310H2O(s)Na2CO3(s)+10H2O(l)

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