An Arrhenius acid is a substance that, when dissolved in water, donates a hydrogen ion (H+) to the solution. Some examples of Arrhenius acids include:

- Hydrochloric acid (HCl)

- Sulfuric acid (H2SO4)

- Nitric acid (HNO3)

- Acetic acid (CH3COOH)

- Citric acid (C6H8O7)

When these acids are dissolved in water, they release H+ ions into the solution, which can then react with other substances.