Processing math: 100%

Acid Dissociation Constant Calculator

Formula

To calculate the Acid Dissociation Constant:

$K_a = \frac{[A^-] \cdot [H^+]}{[HA]}$

Where:

$K_a$ is the Acid Dissociation Constant
$[A^-]$ is the concentration of conjugate base of acid
$[H^+]$ is the concentration of hydrogen ions
$[HA]$ is the concentration of chemical species (HA)

What is Acid Dissociation Constant?

The Acid Dissociation Constant (Ka) is a measure of the strength of an acid in solution. It is the equilibrium constant for the dissociation of an acid into its conjugate base and a hydrogen ion. The larger the Ka value, the stronger the acid.

Example Calculation

Let's assume the following values:

Concentration of Conjugate Base $[A^-]$ = 0.01 M
Concentration of Hydrogen Ions $[H^+]$ = 0.02 M
Concentration of Chemical Species $[HA]$ = 0.1 M

Step 1: Calculate the Acid Dissociation Constant:

$K_a = \frac{0.01 \cdot 0.02}{0.1} = \frac{0.0002}{0.1} = 0.002$

So, the Acid Dissociation Constant (Ka) is 0.002.