Why was hydrochloric acid used for the neutralization experiment using the antacid? Why was hcl chosen over another strong acid?

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.

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.