Definition

A strong corrosive acid that is commonly used as a laboratory reagent. It is formed by dissolving hydrogen chloride in water. GASTRIC ACID is the hydrochloric acid component of GASTRIC JUICE. Acidifying agent, pH control agent. Auxiliary for inversion of sucrose and hydolysis of starch or proteins. Processing aid in beer malting

Description

HCl refers to both hydrogen chloride gas and aqueous hydrochloric acid. Hydrogen chloride gas is a colorless gas formed from the reaction of hydrogen with chlorine. It forms white fumes of hydrochloric acid upon contact with atmospheric humidity. Hydrochloric acid is a highly corrosive, strong mineral acid with many industrial uses. Hydrochloric acid is found naturally in gastric acid. Hydrogen chloride gas and hydrochloric acid are important in technology and industry. For example, hydrochloric acid is used in the chemical industry as a chemical reagent in the large-scale production of vinyl chloride for PVC plastic, and MDI/TDI for polyurethane. It has numerous smaller-scale applications, including household cleaning, production of gelatin and other food additives, descaling, and leather processing. Hydrogen chloride is less widely used, although even in the absence of water, hydrogen chloride can still act as an acid. For example, hydrogen chloride can dissolve in certain other solvents such as methanol, protonate molecules or ions, and serve as an acid-catalyst for chemical reactions where anhydrous (water-free) conditions are desired. Hydrogen chloride is corrosive, particularly in the presence of moisture. Likewise hydrochloric acid is also extremely corrosive. Most hydrochloric acid is sold or is available as a 38% aqueous solution.

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