Acids are
for instance substances that make liquids taste sour:
You taste lactic acid in
curdeled milk, sauerkraut or bread made from leaven.
You taste acidic acid after using
vinegar.
Malic acid and citric acid
are not only present in apples and lemons but also in sour cherries.
Acids are
liquids with a pH range between 0 and less
than 7.
All acids
are proton
(H+) donors: Acid-base
reactions.