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Answers:
Baking Powder is a mixture of a carbonate or bicarbonate and a weak acid. It is used for increasing the volume and lightening the texture of baked goods.
Baking soda (NaHCO3) is the source of the carbon dioxide and the acid-base reaction can be generically represented as shown:
NaHCO3 + H+ → Na+ + CO2 + H2O