Answer:
Hydrochloric acid or HCl is used for the neutralization experiment using the antacid because HCl is the only acid that present in the gastric juice of stomach.
Step-by-step explanation:
HCl is a strong acid secreted by the oxytonic cells of the stomach which generates an acidic environment inside the stomach.
Acidity is caused by the excess release of HCl that cause the pH of the body to fall down.
HCl is used during neutralization experiment to test the effectiveness of antacid over HCl for the treatment of acidity.