Question

why do acids react with salt

Answer 1

" A stronger acid usually reacts with the salt of a relatively weaker acid by displacing the latter from it. Hydrochloric, nitric, and phosphoric acids are often produced by heating their easily available salts with concentrated sulphuric acid. The respective salt of sulphuric acid is the other product of such a reaction. "

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Answer 2

Salts are weak acid and react with strong acid. strong acid can replace weak acid from its salt.