Question 3 • Crowley Original Credit Chemistry B
Answer:
Calcium carbonate acts as a base because it contains the carbonate ion (CO3^2), which can accept free hydrogen ions (H) from the stomach acid. When calcium carbonate reacts with hydrochloric acid in the stomach, it neutralizes the acid and produces water, calcium chloride, and carbon dioxide gas. Crushing or dissolving the antacid tablet before ingestion increases the surface area, which allows the reaction between the carbonate ions and the hydrogen ions to occur more quickly, providing faster relief.