The chemical formula for hydrochloric acid is HCl. Hydrochloric acid is a strong acid formed by the combination of one hydrogen atom (H) and one chlorine atom (Cl). It is a colorless, highly corrosive liquid that is commonly used in laboratories, industry, and even in the stomach as part of digestive processes. In a laboratory setting, HCl is used for various applications, such as pH regulation, metal cleaning, and food processing. Despite its corrosive nature, hydrochloric acid is crucial in many chemical reactions and processes, showcasing its importance in both natural and industrial contexts.