How do you deactivate hydrochloric acid?

Answer 1

Combine it with a base. If you mean hydrochloric acid as in stomach acid, baking soda is an old favorite.

Answer 2

Hydrochloric acid can be neutralized with a base such as sodium bicarbonate or calcium carbonate. Mixing the acid with water can also help reduce its strength. Always remember to wear appropriate safety gear and follow proper handling procedures when working with acids.