Final answer:
Antacids contain alkaline ions that chemically neutralize stomach gastric acid, reducing damage and relieving pain.
Step-by-step explanation:
Antacids contain alkaline ions that chemically neutralize stomach gastric acid, reducing damage and relieving pain. For example, Tums is a very commonly used antacid that can be bought over the counter. Other antacids, such as Alka Seltzer, work in similar ways. The base in the antacid will react with the HCl in the stomach and neutralize it, taking care of that unpleasant feeling.