Ammonia is also commonly used in cleaners ... Your stomach contains hydrochloric acid, and too much of this causes indigestion. Indigestion (or antacid) tablets contain alkalis such as magnesium ...

You also should avoid mixing bleach with other chemicals that are acid-based, including vinegar and oven cleaners. Mixing chlorine bleach with ammonia creates a chemical reaction that can be deadly.

A cotton swab is dipped into concentrated hydrochloric acid (producing hydrogen chloride gas) while a second on is dipped into concentrated aqueous ammonia (producing ammonia gas). Both cotton swabs ...