A(n) is a compound that tastes sour and reacts with some metals.
a. acid
b. base

a. acid

An acid is a compound that tastes sour and reacts with some metals and carbonates. The acid also transforms a blue litmus paper into a red one and is also corrosive. It has both a positive and a negative charge that breaks into water in order to create a hydrogen ion. Some acids are very strong that it can burn or damage your skin when directly applied into it. Acids can be found in vinegar, most citrus fruits and of course the stomach acid.