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Question
Salt A commonly used in bakery products on heating gets converted into another salt B which itself is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B and C.
Solution
The salt A is sodium hydrogen carbonate (baking soda) and is commonly used in bakeries as a constituent of baking powder. Upon heating, it changes to sodium carbonate B and evolves carbon dioxide gas C.
`underset("'A'")(2"NaHCO"_3) overset("heat")(->)underset("'B'")("Na"_2"CO"_3) + underset("'C'")("CO"_2)`
Sodium carbonate removes hardness from water while CO2 gas turns lime water milky.
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