Arrhenius definition
The Arrhenius definition is a concept in chemistry that classifies acids and bases based on their behavior in water. According to this definition, an Arrhenius acid is a substance that increases the concentration of hydrogen ions (H⁺) in an aqueous solution, while an Arrhenius base increases the concentration of hydroxide ions (OH⁻).
This definition, proposed by Swedish chemist Svante Arrhenius in the late 19th century, helps to explain the properties of acids and bases in terms of their ionization in water. It laid the groundwork for further theories, such as the Brønsted-Lowry and Lewis definitions, which expanded the understanding of acid-base chemistry.