what is an acid ? plz answer and follow
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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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An acid is a molecule or ion capable of donating a proton, or, alternatively, capable of forming a covalent bond with an electron pair.
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