how do we define acids
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Acid, any substance that in water solution tastes sour, changes the colour of certain indicators (e.g., reddens blue litmus paper), reacts with some metals (e.g., iron) to liberate hydrogen, reacts with bases to form salts, and promotes certain chemical reactions (acid catalysis).
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Acids are sour in taste, turn blue litmus to red, dissolve in water to release H+ ions.
E.g., vinegar, hydrochloric acid and sulphuric acid.
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