# What does alkalinity mean?

##### 1 Answer
Aug 12, 2018

Alkalinity refers to a substance being basic that is with a pH > 7
where the $O {H}^{-} > {H}_{3} {O}^{+}$

#### Explanation:

The group one metals are called the alkaline metals because when these elements are dissolved ( reacted with) in water the metals from bases. The group two metals are called the alkaline earth metals for the same reasons.