For pickling and cleaning equipment, as well as in the production of food products like corn syrup and sugar.Water treatment: To control pH levels, remove impurities, and clean equipment.Cleaning and surface preparation: For cleaning and etching surfaces, removing rust and scale, and preparing surfaces for painting or coating.Industrial ApplicationsIn addition to these common uses, 35% hydrochloric acid is also used in various industrial applications, including:Chemical synthesis: As a reactant and catalyst in the production of various chemicals, such as plastics, dyes, and pharmaceuticals.Steel processing: To remove rust and scale from steel surfaces, and to control pH levels in steel production.