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Because they are two physically different, albeit closely-related chemical compositions:

Hydrochloric acid is what is generally used as a strong acid in industry and retail for use in Swimming Pools. It is an aqueous solution of HCl, which is a strong acid and therefore dissolves fully in the solvent (water) existing as it's constituent ions H+ and Cl-, separated and interacting with the very polar water molecules. Hydrochloric acid cannot be simply dried/evaporated to create Hydrogen Chloride.

Hydrogen Chloride is the anhydrous form of the molecule HCl as a ionic molecule. It is sometimes referred to as dry HCl or HCl(g), since there is no solvent present and at STP it exists as a gas. This Hydrogen Chloride can be simply bubbled through water to produce Hydrochloric acid. The reverse transformation is not possible, instead a chemical reaction must be used to create Hydrogen Chloride from various reagents (such as Sulfuric acid and Sodium Chloride)

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