Question

What is acid and what are its characteristics ​

Answer 1

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1. 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).

• Acids have a sour taste.
• Acids change the color of certain acid-base indicates.
• Acids react with active metals to yield hydrogen gas.
• Acids react with bases to produce a salt compound and water.

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