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Acid comes from the Latin word acere, which means sour. In dilute concentrations acids are responsible for the sour taste of lemons, limes, vinegar and other substances. Hydrochloric acid is produced in your stomach to help digest food. Sulfuric acid is found in car batteries. Acids can conduct an electric current. Acids are also corrosive. When acids react with metals they form hydrogen gas. When an acid reacts with a carbonate it forms carbon dioxide, …

…A low pH number means there is a high hydrogen ion concentration. The value for a pH number is equal to the negative logarithm of the hydrogen ion concentration. On the pH scale a number below seven is an acid. Acids are an important part of nature and an important part of our lives. We find acid in the food we eat and even in our stomachs. Without acids we wouldn't be able to live.