Suolahappo

Suolahappo, known in English as hydrochloric acid (chemical formula HCl), is a colorless, highly corrosive strong mineral acid. In water it ionizes completely, forming hydronium and chloride ions. The anhydrous gas is also colorless and has a sharp, pungent odor.

In commercial use, hydrochloric acid is predominantly sold as aqueous solutions. Concentrated solutions are typically around 37% by weight, with a density near 1.19 g/mL and a boiling point close to 108°C. The solution is highly miscible with water and strongly acidic, capable of corroding many materials.

Production commonly involves generating hydrogen chloride gas and absorbing it in water. Hydrogen chloride can be produced by reacting hydrogen with chlorine or by releasing gas from reactions such as the interaction of sodium chloride with concentrated sulfuric acid, with the resulting HCl dissolved in water to form hydrochloric acid. In industry, HCl is also produced as a byproduct in various chemical processes, including chlorine production.

Uses are widespread in chemical manufacturing and processing. Hydrochloric acid is used for acidity control (pH adjustment), metal surface treatment and pickling, production of chlorides and various organic syntheses, and in pulp and paper and food-processing applications as a processing aid in limited, regulated amounts.

Safety and handling require strict caution. Hydrochloric acid is highly corrosive to skin, eyes, and mucous membranes and releases irritating fumes. It should be stored in compatible, corrosion-resistant containers (such as certain plastics) away from incompatible materials, with adequate ventilation. Spills should be contained and neutralized, typically with suitable bases, to prevent environmental damage.