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Do HCl and CaCl2 react?

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No they don't because they contain the same kind of anions: Cl-.

(edit) They do not react as such but if the Hydrochloric acid is hydrated then the CaCl2 (2 is subscript) will dehydrate the Hydrochloric acid to make gaseous HCl This will form a white crystal

From the Wikipedia Hydrogen Chloride article

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