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Copyright © Tarek Kakhia. All rights reserved. http://tarek.kakhia.org 6 . 3 . Production of inorganic compounds Numerous products can be produced with hydrochloric acid in normal acid - base reactions, resulting in inorganic compounds. These include water treatment chemicals such as iron (III) chloride and poly aluminium chloride ( PAC ) . Fe2 O3 + 6 HCl → 2 Fe Cl3 + 3 H2O ( iron (III) chloride from magnetite ) Both iron (III) chloride and PAC are used as flocculation and coagulation agents in sewage treatment , drinking water production , and paper production. Other inorganic compounds produced with hydrochloric acid include road application salt calcium chloride, nickel (II) chloride for electroplating, and zinc chloride for the galvanizing industry and battery production . Ca CO3 + 2 HCl → Ca Cl2 + CO2 + H2O ( calcium chloride from limestone ) 6 . 4 . pH Control and neutralization Hydrochloric acid can be used to regulate the basicity ( pH ) of solutions. OH− + H Cl → H2 O + Cl− In industry demanding purity ( food , pharmaceutical , drinking water ) , high - quality hydrochloric acid is used to control the pH of process water streams. In less - demanding industry, technical quality hydrochloric acid suffices for neutralizing waste streams and swimming pool treatment . 6 . 5 . Regeneration of ion exchangers High - quality hydrochloric acid is used in the regeneration of ion exchange resins. Cation exchange is widely used to remove ions such as Na+ and Ca2+ from aqueous solutions, producing 31PDF Image | Chlorine Characteristics
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