ACIDS

Most foods contain acids. Lemon contains citric acid and vinegar contains acetic acid. Different acids give the strong flavor of lemon, vinegar, sour apple and sherbet. battery, sulfuric acid; The digestive juice in the stomach contains hydrochloric acid. Acid is a substance that increases the concentration of hydrogen ions (H+) when dissolved in water. Most acidic substances exist as pure solids, liquids or gases, but only react like acids when dissolved in water.
Acid is a substance that increases the concentration of hydrogen ions in a solution. All acids contain hydrogen (H+).