Why is a mild acid mixed with baking soda in baking powder?
Answer and explanation
Correct answer: To produce carbon dioxide
The governing concept is an acid-carbonate reaction. Baking soda, sodium hydrogen carbonate, reacts with the mild acid in baking powder when moisture is added and often releases carbon dioxide: acid + NaHCO₃ → salt + water + CO₂. The gas forms bubbles that expand during heating, making dough or batter rise and become porous. Therefore option A is correct. The reaction does not produce hydrogen or sodium metal, and the purpose is not to keep food basic.
Frequently asked questions
What is the correct answer to this question?
To produce carbon dioxide
Why is this the correct answer?
The governing concept is an acid-carbonate reaction. Baking soda, sodium hydrogen carbonate, reacts with the mild acid in baking powder when moisture is added and often releases carbon dioxide: acid + NaHCO₃ → salt + water + CO₂. The gas forms bubbles that expand during heating, making dough or batter rise and become porous. Therefore option A is correct. The reaction does not produce hydrogen or sodium metal, and the purpose is not to keep food basic.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
