LYCOS RETRIEVER 
Hydrochloric Acid: Hydrogen Chloride
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Hydrochloric acid is a solution of hydrogen chloride in water. Hydrogen chloride occurs as either a colourless liquid with a an irritating, pungent odour, or a colourless to slightly yellow gas which can be shipped as a liquefied compressed gas; highly soluble in water.
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HYDROCHLORIC ACID MIXTURE contains an aqueous solution of hydrogen chloride, an acidic gas. Reacts exothermically with organic bases (amines, amides) and inorganic bases (oxides and hydroxides of metals). Reacts exothermically with carbonates (including limestone and building materials containing limestone) and hydrogen carbonates to generate carbon dioxide. Reacts with sulfides, carbides, borides, and phosphides to generate toxic or flammable gases. Reacts with many metals (including aluminum, zinc, calcium, magnesium, iron, tin and all of the alkali metals) to generate flammable hydrogen gas. Reacts violently with acetic anhydride, 2-aminoethanol, ammonium hydroxide, calcium phosphide, chlorosulfonic acid, 1,1-difluoroethylene, ethylenediamine, ethyleneimine, oleum, perchloric acid, b-propiolactone, propylene oxide, silver perchlorate/carbon tetrachloride mixture, sodium hydroxide, uranium(IV) phosphide, vinyl acetate, calcium carbide, rubidium carbide, cesium acetylide, rubidium acetylide, magnesium boride, mercury(II) sulfate [Lewis].
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Without a constant supply of hydrochloric acid, many of the nation's businesses would shut down. Hydrochloric acid is a solution of hydrogen chloride gas (HCl) in water. About 1,000 cubic feet of this gas can be dissolved in one cubic foot of water.
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There are a few case reports of individuals, often with pre-existing asthmatic conditions, who have developed asthma following exposure to hydrogen chloride gas or to hydrochloric acid mist. These cases are believed to be reactive airways dysfunction syndrome (RADS), which is airways hypersensitivity caused by very high, usually one-time exposure to a highly irritating gas.(48,49,50,51)
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Hydrogen Chloride