There are three theories that identify a singular characteristic which defines an acid, as well as a base. These three acid-base theories are: the Arrhenius Theory, the Bronsted-Lowry Theory, and the Lewis Theory. Click each theory to find out more. For now, focus on the first part of each theory regarding acids.
In addition to these theories, the following chemical equation is used for making acids in general:
Nonmetal Oxide + Water → Acid
Nonmetal Oxide + Water → Acid
If you fully understand the theories that define an acid, click here to continue onto its properties.