Percent ionization is the quantity of a weak acid that ionizes in a solution expressed as a percentage.

The percent ionization of a given acid varies depending on the original concentration of the acid.

**Formula to calculate percent ionization.**

- H+ is the molarity.
- HA is an acid that dissociates into A-, the conjugate base of an acid and an acid and a hydrogen ion H+.

**Example:**

Suppose you calculated the H+ of formic acid and found it to be 3.2mmol/L, calculate the percent ionization if the HA is 0.10.

Therefore, the percent ionization is 3.2%.