# Weak acid

Jump to: navigation, search

A weak acid is an acid chemical which does not dissociate (split into ions) completely when in a water solution. This means it does not give all its hydrogen ions into the water. Weak acids typically have a pH between 3 and 6.

Acetic acid (CH3COOH) and oxalic acid (H2C2O4) are examples of weak acids. If an acid is represented by HA, then there is a balance between molecules which are split (ionised), and molecules which are not:

${\displaystyle \mathrm {HA_{(aq)}\,\leftrightarrow \,H^{+}\,_{(aq)}+\,A^{-}\,_{(aq)}} }$