# What is an arrhenius base?

##### 1 Answer
Jun 20, 2016

An Arrhenius base is something that increases the ${\text{OH}}^{-}$ concentration, and decreases the ${\text{H"_3"O}}^{+}$ concentration, when it is dissolved in water. An Arrhenius acid does the opposite.

#### Explanation:

The Arrhenius theory of acids and bases is little used today. This is not because it is wrong; it isn't. Instead it's been expanded to include additional cases that the original theory did not cover.

These expanded theories include the ones with which you are probably more familiar:

• The Bronsted-Lowry theory which considers proton transfer whether water is involved or not.
• The Lewis theory where acids create polar or ionic products by drawing electron pairs from bases.