Acid is a chemical substance that typically has a sour taste and can react with alkali to form salts and water. The chemical properties of acids include the ability to react with metals to produce hydrogen gas, react with bases to produce salts and water, and react with certain oxides to produce salts and water. There are many types of acids, including inorganic acids and organic acids. Inorganic acids include sulfuric acid, hydrochloric acid, oxalic acid, etc., while organic acids include acetic acid, citric acid, malic acid, etc. Acid has many applications in daily life, such as regulating the acidity and alkalinity of food in food processing, removing dirt in cleaning agents, and treating certain diseases in medicine.
