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

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


 

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Answer:

On heating \text {NaHCO}_{3} (baking soda), \text {CO}_{2} (carbon dioxide) gas is given out that turns lime water milky.

\text {2NaHCO}_{3}\rightarrow \text {Na}_{2}\text {CO}_{3}+\text {H}_{2}\text {O}+\text {CO}_{2}\text {(g)}

While on heating \text {Na}_{2}\text {CO}_{3}.\text {10H}_{2}\text {O} (washing soda) water of crystallisation is given out and the salt becomes anhydrous. The presence of water of crystallisation given as product can be tested by treating it with anhydrous \text {CuSO}_{4} (white) which becomes blue in colour in its contact.

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