We all know about stomach acid and how it helps us digest the food we eat. But did you know that this acid in your stomach is so strong that it can even dissolve metal? Stomach acid, also called gastric acid is composed of Hydrochloric acid, potassium chloride, and sodium chloride. The concentration of Hydrochloric acid is very low, but it still makes the stomach acids very acidic! They are strong enough to dissolve metal!