What is the behavior of acids in relation to protons?

Acids are characterized by their ability to donate protons (H⁺ ions) in chemical reactions. According to the Brønsted-Lowry theory of acids and bases, an acid is defined as a substance that can release protons into a solution. When an acid is dissolved in water, it increases the concentration of hydrogen ions, which is crucial for many chemical processes and reactions, including those involved in biological systems.

This proton donation is what distinguishes acids from bases, which accept protons. Understanding this behavior helps explain the properties of acids, such as their sour taste and their ability to conduct electricity in solution due to the presence of free hydrogen ions. Hence, recognizing that acids donate protons is fundamental to comprehending acid-base chemistry.