May 2003

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HP Water Management: Understanding alkalinity

Alkalinity is naturally present in raw water and is an important control parameter in boilers with softened water make-up and cooling water systems. Understanding alkalinity requires underst..

Huchler, L. A., MarTech Systems, Inc.

Alkalinity is naturally present in raw water and is an important control parameter in boilers with softened water make-up and cooling water systems. Understanding alkalinity requires understanding the dissolution of carbon dioxide in water:    CO2(gas) + H2O ßà CO2(aqueous) (1) Carbon dioxide dissolves in water to produce carbonic acid:    CO2(aqueous) + H2O ßà H2CO3 (2) Carbonic acid is a weak dibasic acid (containing two ionizable hydrogen atoms) that ionizes reversibly in

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