Acid

Substance containing hydrogen which may be replaced, either wholly or in part, by a metal, when the acid is brought in contact with either a metal, a metallic oxide, or a metallic hydroxide. Acids usually po e a corrosive action, a sour taste, and the power to change certain vegetable colors from blue to red. When treated with a base (q.v.) acids form a salt and water. Acids are divided into two cla es: those containing oxygen are called oxy-acids; those containing no oxygen are called hy