An acid (A) with sodium hydrogencarbonate is used in making the cakes fluffy and spongy. It is due to the release of (B) gas in the reaction. Here, A and B are
Baking powder contains a mixture of baking soda and an acid, i.e., tartaric acid (A). When baking powder is heated or mixed in water, the following reaction takes place:
Carbon dioxide gas (B) is produced during the reaction causes cake to rise making them soft, fluffy and spongy.
Thus, A is tartaric acid.
B is carbon dioxide (CO2)
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