* Arrhenius Acid: An Arrhenius acid is a substance that produces hydrogen ions (H+) when dissolved in water.

* Brønsted-Lowry Acid: A Brønsted-Lowry acid is a substance that donates a proton (H+) in a chemical reaction.

* Base: A base is a substance that accepts a proton (H+).

The statement "an Arrhenius acid is a Brønsted-Lowry base, not a base" is incorrect.

Here's why:

* Arrhenius acids are also Brønsted-Lowry acids. The definition of an Arrhenius acid fits perfectly into the Brønsted-Lowry definition. When an Arrhenius acid dissolves in water, it releases H+ ions, which act as proton donors.

* Arrhenius acids are not Brønsted-Lowry bases. Brønsted-Lowry bases *accept* protons. Arrhenius acids *donate* protons.

In summary:

* An Arrhenius acid is a type of Brønsted-Lowry acid.

* Arrhenius acids do not fit the definition of a Brønsted-Lowry base.

Let me know if you'd like more explanation on any of these definitions!