LYCOS RETRIEVER 
Hydrochloric Acid: Solutions
built 633 days ago
Hydrochloric acid solutions can readily release high concentrations of hydrogen chloride gas, which is very toxic and corrosive and poses a serious inhalation hazard. The gas absorbs moisture from the air and can form an acid fog in damp air.(44) The gas is very soluble in water and reacts with the surface of the upper respiratory tract where the majority is neutralized and not likely to cause effects on the lungs.(45,46) However, higher penetration of the respiratory system can be expected with higher breathing rates and, based on animal information, from higher concentrations.(17)
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Health hazards given on this data sheet apply to concentrated solutions of hydrochloric acid. Hazards of dilute solutions may be reduced, depending upon the concentration. Degree of hazard for these reduced concentrations is not currently addressed in the available literature.
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An important application of high-quality hydrochloric acid is the regeneration of ion exchange resins. Cation exchange is widely used to remove ions such as Na+ and Ca2+ from aqueous solutions, producing demineralized water.
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