An Arrhenius Acid is characterized by which of the following?

An Arrhenius Acid is defined as a substance that, when dissolved in water, increases the concentration of hydrogen ions (H⁺) in the solution. This is related to the pH scale, where a lower pH indicates a higher concentration of hydrogen ions. The pH scale ranges from 0 to 14, with values below 7 indicating acidic solutions due to the presence of more H⁺ ions compared to hydroxide ions (OH⁻). Therefore, a pH value below 7 is characteristic of Arrhenius Acids, confirming that these substances contribute to acidity in aqueous solutions.

In contrast, substances that are above a pH of 7 are deemed basic or alkaline, and a neutral solution has a pH of 7. Electron pair donors and proton acceptors relate to other definitions of acids and bases, specifically the Lewis and Brønsted-Lowry theories, which do not apply in the context of Arrhenius definitions.