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Question
How would you distinguish between baking powder and washing soda by heating?
Solution
- Baking soda is sodium hydrogen carbonate (NaHCO3). Upon heating, it will evolve CO2 gas which upon passing through lime water, will make it milky.
`2"NaHCO"_3 overset("heat")(-> )"Na"_2"CO"_3 + "H"_2"O" + "CO"_2` - Washing soda is sodium carbonate decahydrate (Na2CO3.10H2O). Upon heating, it will not evolve any gas.
`"Na"_2"CO"_3. 10"H"_2"O" overset("heat")(->) "Na"_2"CO"_3 + 10"H"_2"O"`
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